The top two contenders for the GOP nomination, Jeb Bush and Rand Paul, are both running in the race for the White House, with former Massachusetts governor Mitt Romney and Wisconsin Gov.
Scott Walker both running for the Libertarian ticket.
Both candidates, however, are far from the consensus choice of many voters.
While Romney and Walker are seen as strong supporters of traditional family values and strong conservatives, both candidates have taken a tougher stance on immigration.
Romney, for instance, has called for a pathway to citizenship for undocumented immigrants and said he will not support a pathway for those who are already here.
Bush, meanwhile, has said he wants to “build a wall” along the U.S.-Mexico border, an idea that many Republicans and conservatives say would make it harder for them to gain legal status.
Both Bush and Walker have also called for tougher border security measures, though the Republican candidate is the one who has been criticized for proposing some.
Trump, meanwhile — a former reality TV star — has proposed a pathway that would allow undocumented immigrants to remain in the U., while also providing a path to citizenship and lowering taxes.