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The 2016 Republican presidential race is down to the Final Four! 

At Detroit's historic Fox Theatre, Donald Trump, Marco Rubio, Ted Cruz and John Kasich are facing off tonight in a Fox News debate, moderated by Megyn Kelly, Bret Baier and Chris Wallace. 

Just hours before the debate Mitt Romney delivered an address in which he urged GOP voters to nominate anyone but Trump, prompting the billionaire to issue a blistering response.

Check out the highlights of the night below...

Will the candidates support Trump if he wins the nomination?

A lighter moment as Marco Rubio cracks up the crowd with a yoga joke...

Megyn Kelly pressed Donald Trump on how often he changes his positions.

She played a montage of him reversing course on the if the U.S. should have been involved in the War in Afghanistan, if the U.S. should accept refugees from the Middle East and if President George W. Bush purposefully lied to get the U.S. involved in the Iraq War.

Donald Trump faced challenges at the Fox News GOP debate on Trump University, as he faces a class-action lawsuit from people who took the classes.

Marco Rubio said Trump "said whatever he had to say" to get people to borrow money to go to a "fake university."

At tonight's GOP debate, Megyn Kelly asked Donald Trump about an off-the-record interview he had with The New York Times in which he allegedly expressed "flexibility" in his immigration policy, specifically with his promise to deport 11 million illegal immigrants currently in the U.S.

Trump said that there has to be flexibility and negotiation when any deal is made.

"I may have discussed something like that with The New York Times, but I would never release off-the-record conversations," Trump said.

Cruz then argued that the tape may prove that Trump is expressing rhetoric to voters that he doesn't really believe.

"Simply release the tape," said Cruz, arguing that Trump has a record of hiring illegal aliens instead of American workers.

Rubio accused Trump of never answering questions and choosing instead to attack others.

Trump argued that Rubio has never employed anyone, with the senator claiming that Trump has "ruined" companies that he's started.

Trump then repeatedly called Rubio "little Marco," prompting Rubio to answer, "OK, big Don."

Trump responded to Rubio by saying he's never heard anyone question the size of his hands. 

"Look at those hands. Are they small hands? He said if they're small, something else must be small. I guarantee you there's no problem," he said to laughter from the audience. 

Chris Wallace asked Trump about his views on the KKK and white supremacy after he initially failed to disavow David Duke during a Sunday interview. 

Trump repeated that he totally disavows the KKK and Duke and that he has been doing so consistently.


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