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.

"There's a big question mark on your head, and you can't do it to the party," Trump said.

"I'll tell you, I'm not going to be taking legal advice from Donald Trump," Cruz said.

This video includes images from Getty Images. 

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Prosecutor Skandalakis has previously suggested that pursuing criminal charges against President Donald Trump may not be feasible until after he leaves office in 2029. (Craig Hudson/Politico/Bloomberg via Getty Images)

Credit: Bloomberg via Getty Images