Photos from the GOP Debate at Fox Theatre in Detroit

Republican presidential candidates are going to be regrouping after a bruising debate Thursday night at the Fox Theatre in Detroit.

The last four candidates were there: John Kasich, Ted Cruz, Marco Rubio and front runner Donald Trump. Detroit native Ben Carson did not attend the debate, though he has not yet officially suspended his campaign.

Moderators for the evening were FOX News' Bret Baier, Chris Wallace and Megyn Kelly. All eyes were on Kelly as she faced Trump again for the first time since their clash at the first GOP debate last summer. Trump then boycotted an Iowa debate that Fox telecast in January after the network refused to remove Kelly as one of the moderators. The two seemed to come to a truce of sorts, though, last night.

Kelly greeted Trump, with a "You're looking well," reply from the businessman.

Perhaps the biggest takeaway from the debate was the continual attacks on Donald Trump. He was under fire before even taking the stage as Mitt Romney warned voters earlier on in the day to shun Trump.

You can get a full recap of the debate here.

Meanwhile, much of the crew from FOX News said the Fox Theatre in Detroit was their favorite venue they've ever been at. You can check out photos of the evening in the photo gallery above.

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For a complete photo gallery of the debate, CLICK HERE

The Associated Press contributed to this report.