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| Sparks fly in second Republican 2016 debate | |
| (35 minutes later) | |
| A debate between the top Republican candidates in the 2016 presidential election has begun with a fiery exchange of verbal punches. | |
| Frontrunner Donald Trump has come under fierce attack at the Ronald Reagan Presidential Library in California. | |
| Rand Paul, a Kentucky senator, said Mr Trump's "playground" insults made him unsuitable to be a president involved in international negotiations. | |
| There are 15 Republicans hoping to be the party's White House nominee. | There are 15 Republicans hoping to be the party's White House nominee. |
| Read our live updates of the debate | |
| Join in our debate on Facebook | |
| As the main debate began, all eyes were on Mr Trump, who is being pursued by neurosurgeon Ben Carson and, further behind, former Florida Governor Jeb Bush in recent polls. | |
| In his introduction, Mr Trump promised to "make America great again", while Jeb Bush said he would "fix a broken Washington" and enable people to "rise up". | |
| An undercard debate for the four other Republican candidates happened on the same stage earlier. | An undercard debate for the four other Republican candidates happened on the same stage earlier. |
| In a combative atmosphere, the four were split over the case of Kim Davis, the Kentucky clerk who defied a Supreme Court ruling and refused to issue marriage licences. | In a combative atmosphere, the four were split over the case of Kim Davis, the Kentucky clerk who defied a Supreme Court ruling and refused to issue marriage licences. |
| What to watch for | What to watch for |
| Political observers say the debate could centre on attacks between Donald Trump and the rest of the field. | Political observers say the debate could centre on attacks between Donald Trump and the rest of the field. |
| Once written off as a temporary phenomenon, Mr Trump has shown that his popularity can be sustained - with some saying he could win early primary states. | Once written off as a temporary phenomenon, Mr Trump has shown that his popularity can be sustained - with some saying he could win early primary states. |
| "He's in complete, total control of the political battle space," said Steve Schmidt, a strategist for Sen John McCain's 2008 campaign. | "He's in complete, total control of the political battle space," said Steve Schmidt, a strategist for Sen John McCain's 2008 campaign. |
| The real estate magnate will be flanked by a cadre of political outsiders. | The real estate magnate will be flanked by a cadre of political outsiders. |
| Among them is Carly Fiorina, a former tech executive and the only woman in the field, who was not allowed to participate in the primetime debate in August because of poor performance in the polls. | Among them is Carly Fiorina, a former tech executive and the only woman in the field, who was not allowed to participate in the primetime debate in August because of poor performance in the polls. |
| However, CNN, the American television network that is hosting the debate, amended the rules, opening a path for the former Hewlett-Packard executive to take to the main stage. | However, CNN, the American television network that is hosting the debate, amended the rules, opening a path for the former Hewlett-Packard executive to take to the main stage. |
| Also on the stage will be Mr Carson, who has climbed in recent polling. | Also on the stage will be Mr Carson, who has climbed in recent polling. |
| During the last debate little attention was paid to the soft-spoken candidate, but after seeing his popularity rise political observers say he'll be looking to show that he deserves greater attention. | During the last debate little attention was paid to the soft-spoken candidate, but after seeing his popularity rise political observers say he'll be looking to show that he deserves greater attention. |
| The Democratic Party will hold its first debate in Nevada in October, hosted by CNN. | The Democratic Party will hold its first debate in Nevada in October, hosted by CNN. |
| By next summer, each party will have a presidential nominee who will do battle in the race for the White House. Votes will finally be cast in November 2016. | By next summer, each party will have a presidential nominee who will do battle in the race for the White House. Votes will finally be cast in November 2016. |
| 2016 runners and riders | 2016 runners and riders |
| Meet all of the 2016 hopefuls | Meet all of the 2016 hopefuls |