"The person you're referring to, " Clinton said, after being asked about Trump; "he always combines building a wall and deporting 11 or 12 million people so that they're on the other side of the wall. That to me is not only foolish, it's offensive."

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Both of Clinton's Democratic opponents, Bernie Sanders and Martin O'Malley, oppose building a border wall, while Republican counterparts Donald Trump, Ted Cruz and Marco Rubio simply love the idea.

Here's what all the candidates had to say about immigration tonight: