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What is Biden doing differently at US border? What are President Biden's challenges at the border?
(5 months later)
Asylum seekers arrive in US after year-long wait in Mexico Since taking office in January, US President Joe Biden has been beset by a string of crises at the southern US border.
On the campaign trail, Joe Biden made sweeping promises to reform US immigration, vowing to "take urgent action" to undo the policies of Donald Trump. From criticism over deportations and the treatment of Haitian immigrants to an influx of unaccompanied children and concerns about Covid, there's been no end to the challenges the administration faces along the border with Mexico.
And since taking office, the Democrat has created a taskforce to reunify migrant children with their families, paused construction of the border wall, and called for reviews of legal immigration programmes terminated by his predecessor. Despite those challenges, Mr Biden has vowed to make good on sweeping promises to reform US immigration, vowing to "take urgent action" to undo the policies of Donald Trump.
He has also presided over a record-breaking influx of arrivals to the US southern border, including hundreds of unaccompanied children who are being held in US immigration detention facilities. Here's what we know.
Here's a look at what Mr Biden has - and hasn't - done so far, and how it differs from Mr Trump. Border detentions spike to 21-year high
US to allow in asylum seekers waiting in Mexico While the number of migrants at the border had been steadily increasing since April 2020, the numbers spiked sharply after Mr Biden took office.
Migrant girl held by US for 531 days and counting Migrants continue to cross the border in one of two ways. Those who "have suffered persecution or fear that they will suffer persecution" in their home country are eligible for asylum when they present themselves at a port of entry for admission into the US.
What voters think of Biden immigration policy Others may evade immigration inspectors and border patrol by hiding in vehicles or travelling undetected across unprotected and often treacherous sections of the US-Mexico border.
DIFFERENT According to the Pew Research Center, at least 40% of unauthorised migrants in the country entered legally on short-term visas and overstayed.
While Mr Biden has avoided the harsh rhetoric of Donald Trump, his predecessor, he has still repeatedly called on migrants to not attempt the journey to the US.
In August, over 208,800 people were detained crossing the border. The figure marked a reduction from July, when 212,672 people were taken into custody - a 21-year high.
Despite the August slight decline, the number of migrant encounters still represents about a 45% increase from the 144,000 recorded in May 2019 - the highest total during the Trump administration.
There's also been a sharp increase in the number of children crossing the border. Of August's total, 18,847 were teens and children not travelling with a legal guardian, about in line with figures from the previous month.
During the Trump administration, by comparison, the highest number of unaccompanied minors over a single month was approximately 11,000.
Title 42 Expulsions
On Covid, Mr Biden has so far left a Trump-era emergency policy in place.
The policy - known as Title 42 - is aimed at preventing the spread of Covid-19 in holding facilities, officials say. It allows US authorities to automatically expel almost all undocumented migrants seeking entry, bypassing normal immigration laws and protections.
The controversy surrounding Title 42 was starkly highlighted in September, when the Biden administration used the policy as justification to deport nearly 4,000 Haitian migrants without allowing them to seek asylum.
Why are so many Haitians at the US-Mexico border?
In contrast to Mr Trump, Mr Biden has decided not to refuse entry to unaccompanied migrant children or teenagers. Some families are also exempt.
The Biden administration has defended the Title 42 policy in courts, where civil rights groups have argued that it violates existing US asylum laws. Politicians from Mr Biden's own Democratic Party have also spoken out against it.
The US Centers for Disease Control and Prevention (CDC) said in August that the policy will remain in effect until the spread of Covid by non-citizens stops being a "serious danger" to public health.
It plans to review the situation every 60 days.
Reuniting Families
As mandated by US anti-trafficking laws, Mr Biden's administration has been transferring most immigrant minors to shelters overseen by the government. (Children from Mexico, however, are still being repatriated, which has been criticised by Amnesty International and other organisations).
The administration had previously been criticised for placing migrant children in detention centres at times when shelter space was limited. In response to the influx of unaccompanied children, the administration reopened several previously shuttered detention centres.
Watch: Texas migrant camp "kids feel like they're in prison"
Activists - and some fellow Democrats - accused Mr Biden of repeating the policies of Mr Trump, who himself had also come under fire for the detention centres.
In May, the number of children held in those facilities declined by nearly 90% after they were transferred to the Department of Health and Human Services (HHS) for temporary resettlement.
Mr Biden has also reversed a so-called "zero-tolerance" policy under the Trump administration that saw families divided by US authorities, in some cases with parents being deported back to their home countries without their children.
Some families - but not all - have been reunited.
According to a reunification task force set up by the Biden administration in January, 3,913 children had been separated from their families between 2017 and 2018.
A September court filing from the Justice Department and American Civil Liberties Union said that authorities are still trying to reach the parents of 303 children.
The Remain in Mexico Policy
On Mr Biden's first day in office, the Department of Homeland Security (DHS) suspended a controversial Trump-era policy that forced asylum seekers to wait in Mexico for their US immigration hearings.
Efforts to end the policy - known as the Migrant Protection Protocols (MPP) - are now bogged down in legal wrangling.
In August, the US Supreme Court ordered the president to revive it, rejecting a bid to block a Texas-based judge's ruling requiring it be brought back.
DHS has appealed the decision. On Wednesday, it said it would uphold the order "in good faith" but still plans to issue a new memorandum terminating MPP in the coming weeks.
Separately, in late September, Texas' attorney general filed a lawsuit to try force it to be reinstated.
About 70,000 migrants were enrolled in the programme since it was introduced in January 2019.
Shortly after Mr Biden's inauguration, his administration began to gradually process these tens of thousands of people waiting in Mexico, allowing them into the US while their cases are heard.
So far about 13,000 people enrolled in MPP have been allowed to enter the country to await the outcome of their cases.
Refugee capRefugee cap
In April, Mr Biden stunned his supporters by announcing plans to only allow 15,000 refugees into the US in 2021. The annual refugee cap was set by Mr Trump the year before, and was an historic low. On 27 September, the US State Department announced that the government plans to increase the number of refugees allowed into the US to 125,000 for the fiscal year that begins on 1 October.
Mr Biden soon reversed course following a backlash, and raised the number to 62,500 refugees. He also pledged to increase the refugee cap in 2022 to 125,000. While still a candidate, Mr Biden had made a reform of Mr Trump's historically low refugee cap of 15,000 a major campaign promise.
In April, however, many of Mr Biden's supporters expressed dismay after his administration announced initial plans to keep the 15,000 refugee cap in 2021.
Following intense public backlash, Biden raised the number to 62,500 refugees.
About 110,000 refugees were admitted to the US in the last year of Barack Obama's final presidential term.About 110,000 refugees were admitted to the US in the last year of Barack Obama's final presidential term.
Mr Biden also called for more refugees to come from Africa, the Middle East and Central America, and for an end to restrictions on resettlements from Somalia, Syria and Yemen.Mr Biden also called for more refugees to come from Africa, the Middle East and Central America, and for an end to restrictions on resettlements from Somalia, Syria and Yemen.
Mexican asylum seekers wait to register at a migrant camp at the US-Mexico border Border Wall
Separating families
Over 178,000 people were arrested crossing the border in April, the most ever recorded in a single month.
Some 16,933 were children who were not travelling with their legal guardian encounters in April, down slightly from March figures, according to US Customs and Border Protection (CBP) data.
The previous monthly high of 11,000 lone children recorded in May 2019 came during Mr Trump's presidency.
The influx of minors swiftly overwhelmed migration processing facilities and saw thousands of children put in CBP facilities originally designed to hold adults.
Mr Biden's critics have suggested that holding children in those detention facilities harkens back to a Trump-era policy, the major change being that children are held for less time under President Biden.
The numbers of children held by CBP dropped by 88% by early May, as the children were transferred to the Department of Health and Human Services for temporary resettlement as their immigration case is heard by the courts.
Massive drop in children held by border officials
Unlike under Mr Trump, the Biden White House has not sought to crackdown on families arriving together by separating children from parents.
Mr Trump's so-called "zero tolerance" policy saw families divided by US authorities, in some cases with parents being deported back to their home countries without their children. The policy was reversed and some families - but not all - reunited.
A taskforce enacted by Mr Biden in January to reunite the remaining families began to do so in the US in early May. The panel estimates that about 1,000 families remain separated.
Mr Biden ended the Remain in Mexico policy on his first day in office
The Remain in Mexico policy
On Mr Biden's first day in office, the Department of Homeland Security (DHS) suspended a controversial Trump-era policy that forced asylum seekers to wait in Mexico for their US immigration hearings.
About 70,000 migrants were enrolled in the Migrant Protection Protocols (MPP) - informally known as the Remain in Mexico programme - since it was introduced in January 2019.
In February, the Biden administration began to gradually process these tens of thousands of people waiting in Mexico, allowing them into the US while their cases are heard.
Still, Biden officials have stressed that migrants should not attempt to enter the US right now, saying more time is needed to rebuild the asylum systems they say were dismantled by Mr Trump.
Protections for Dreamers
The Biden administration has taken several steps to reform the country's legal immigration system.
The president has proposed a major immigration bill that would offer an eight-year pathway to citizenship to the estimated 11 million undocumented people living in the country.
The legislation would also provide permanent protection for young migrants in the Deferred Action for Childhood Arrivals (Daca) program, known as Dreamers.
As part of his efforts to curb immigration, Mr Trump had sought to end the programme in 2017, calling it unconstitutional. His efforts were ultimately blocked by the courts.
Mr Biden's pro-immigration policy - which would greatly increase both family-based and employment-based legal immigration - is facing staunch opposition in Congress, among Republicans and some moderate Democrats.
Border wall
After coming into office vowing not to build "another foot" of Mr Trump's border wall, Mr Biden signed an order on his first day in office to pause all wall construction and to end the national emergency declaration on the southern border.After coming into office vowing not to build "another foot" of Mr Trump's border wall, Mr Biden signed an order on his first day in office to pause all wall construction and to end the national emergency declaration on the southern border.
He later ordered that military funds Mr Trump had tapped for the project be re-allocated, leading to a Republican-requested inquiry into whether Mr Biden had inappropriately re-directed congressionally approved funds.He later ordered that military funds Mr Trump had tapped for the project be re-allocated, leading to a Republican-requested inquiry into whether Mr Biden had inappropriately re-directed congressionally approved funds.
Property owners near the border have complained that despite the pause, the government is still seeking to seize border lands for future construction using a process known as eminent domain. Property owners near the border have complained that despite the pause, the government is still seeking to seize borderlands for future construction using a process known as eminent domain.
Dozens of eminent domain cases brought by the federal government remain open and could take years for the courts to decide.Dozens of eminent domain cases brought by the federal government remain open and could take years for the courts to decide.
Some wall construction sites remain abruptly abandoned, with building materials strewn about, as construction had been ongoing right up until the moment of Mr Biden's order to halt.Some wall construction sites remain abruptly abandoned, with building materials strewn about, as construction had been ongoing right up until the moment of Mr Biden's order to halt.
How are migrants entering the US?
Migrants cross the border in one of two ways.
Those who "have suffered persecution or fear that they will suffer persecution" in their home country are eligible for asylum when they present themselves at a port of entry for admission into the US.
Others may evade immigration inspectors and border patrol by hiding in vehicles or travelling undetected across unprotected - and typically treacherous - sections of the US-Mexico border.
According to the Pew Research Center, at least 40% of unauthorised migrants in the country entered legally on short-term visas and overstayed.
SIMILAR
Anti-Covid measures
On Covid, Mr Biden has so far left a Trump-era emergency policy in place. The policy allows US authorities to automatically expel almost all undocumented migrants seeking entry, bypassing normal immigration laws and protections.
But unlike Mr Trump, Mr Biden has decided not to refuse entry to unaccompanied migrant children or teenagers.
The Biden administration has defended the Trump-era policy in courts, where civil rights groups have sued to have the US asylum system continue processing claims.
Urging potential migrants to stay home
Without using the rhetoric of his predecessor, Mr Biden has called for migrants to not attempt the dangerous journey to the US in an effort to stem the recent influx.
"I can say quite clearly: don't come over," he said in an ABC News interview in March.
"We're in the process of getting set up, don't leave your town or city or community," he added.