Cruz's citizenship again questioned during Republican debate

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After a week of trading barbs about Sen. Ted Cruz's citizenship, he and Donald Trump brought the fight to the debate.

Cruz was born in Canada to an American mother. He maintains his citizenship is "settled law."

At Thursday's debate, Donald Trump said, "I was born here. Big difference."

To which Cruz replied, "On the issue of citizenship, I'm not going to use your mother's birth against you."

"Because it wouldn't work," Trump quipped.

Trump has been bringing up Cruz's citizenship as an issue for some time.