Read Live Updates From The Fox News GOP Debate

It's a Megyn Kelly/Donald Trump reunion!

Four Republican presidential contenders are coming together again for a debate hosted by Fox News in Detroit.

Business mogul Donald Trump, Ohio Gov. John Kasich and Sens. Ted Cruz (Texas) and Marco Rubio (Fla.) will take part in the event. Retired neurosurgeon Ben Carson announced Wednesday he would not take part in the debate, saying he did "not see a political path forward" for his campaign.

The debate marks the reunion between Trump and Fox News host Megyn Kelly. Trump famously refused to take part in the last debate Kelly hosted.

Read live updates on the debate below: