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| US election: Trump steps back from Republican support pledge | US election: Trump steps back from Republican support pledge |
| (35 minutes later) | |
| US Republican front-runner Donald Trump has dropped his pledge to support the party candidate if he does not win the nomination for the November election. | US Republican front-runner Donald Trump has dropped his pledge to support the party candidate if he does not win the nomination for the November election. |
| Mr Trump's rivals, Ted Cruz and John Kasich, refused to say outright whether they would unite behind a nominee. | Mr Trump's rivals, Ted Cruz and John Kasich, refused to say outright whether they would unite behind a nominee. |
| All the Republican candidates signed a loyalty pledge last November. | All the Republican candidates signed a loyalty pledge last November. |
| It is the latest sign of friction between Mr Trump and Mr Cruz, who have been embroiled in a dispute involving each other's wives. | It is the latest sign of friction between Mr Trump and Mr Cruz, who have been embroiled in a dispute involving each other's wives. |
| A committee supporting Mr Cruz published a nude photo of Mr Trump's wife Melania from 2000. In retaliation, Mr Trump tweeted an unflattering picture of Mr Cruz's wife Heidi. | A committee supporting Mr Cruz published a nude photo of Mr Trump's wife Melania from 2000. In retaliation, Mr Trump tweeted an unflattering picture of Mr Cruz's wife Heidi. |
| Mr Trump claims he has been "treated very unfairly" by Republican party leaders - some have expressed disquiet or downright opposition to him winning the nomination. | Mr Trump claims he has been "treated very unfairly" by Republican party leaders - some have expressed disquiet or downright opposition to him winning the nomination. |
| To a question about whether he maintained his loyalty pledge from last November, Mr Trump said: "No, I do not any more." | To a question about whether he maintained his loyalty pledge from last November, Mr Trump said: "No, I do not any more." |
| At the time of the pledge, Trump had said: "I have no intention of changing my mind." | At the time of the pledge, Trump had said: "I have no intention of changing my mind." |
| All three Republicans appeared at a CNN event on Tuesday night in Wisconsin, where voters will pick their presidential nominees next week. | All three Republicans appeared at a CNN event on Tuesday night in Wisconsin, where voters will pick their presidential nominees next week. |
| When asked the same question about supporting the eventual nominee, Mr Cruz did not give a direct answer but said: "I am not in the habit of supporting someone who attacks my wife and attacks my family." | When asked the same question about supporting the eventual nominee, Mr Cruz did not give a direct answer but said: "I am not in the habit of supporting someone who attacks my wife and attacks my family." |
| Mr Kasich said only that he would "see what happens". | Mr Kasich said only that he would "see what happens". |
| The fact none of the three will commit to supporting the winner shows how bitter the race has become, says the BBC's Anthony Zurcher in Washington. | |
| And it will be very hard to unite the party after the convention in July, when the nominee will be formally chosen, he adds. | |
| The billionaire has been repeatedly criticised by his rivals and observers for a campaign that has included personal attacks at rivals and criticism and violence against protesters. | The billionaire has been repeatedly criticised by his rivals and observers for a campaign that has included personal attacks at rivals and criticism and violence against protesters. |
| Earlier on Tuesday, Mr Trump's campaign manager Corey Lewandowski was charged with assaulting a journalist at a campaign event. | Earlier on Tuesday, Mr Trump's campaign manager Corey Lewandowski was charged with assaulting a journalist at a campaign event. |
| Despite the controversies, Mr Trump is currently well ahead in the Republican race with 739 delegates to Mr Cruz's 465. | |
| In the Democratic race, Bernie Sanders will be hoping in Wisconsin to capitalise on some stunning recent wins to overhaul Hillary Clinton's lead. | In the Democratic race, Bernie Sanders will be hoping in Wisconsin to capitalise on some stunning recent wins to overhaul Hillary Clinton's lead. |
| More on the Trump campaign | More on the Trump campaign |
| The 40-year hurt - how Bruce Springsteen articulated the forces that underpin the rise of Trump | The 40-year hurt - how Bruce Springsteen articulated the forces that underpin the rise of Trump |
| Trumpisms - 22 things that Trump believes | Trumpisms - 22 things that Trump believes |
| A civil war - Lifelong Republicans turned off by Trump | A civil war - Lifelong Republicans turned off by Trump |