Instead of participating in tonight’s debate, Trump opted to give a speech in Detroit, where autoworkers are on strike against the Big Three automakers. In a recent Morning Consult poll, 54 percent of Americans said they support the strike by the United Auto Workers against General Motors, Ford and Stellantis, while just 18 percent were opposed and 28 percent didn’t have an opinion.
—Analysis by 538

Tonight, I’m watching the debate from Michigan, where I’m covering a split within the GOP. I’m looking for signs of where the party is breaking with Trump and where they’re still loyal to him. I’m also listening for the candidates’ positions on issues Republican voters in this state say they care about. They’re still angry over the COVID-19 shutdowns, they’re mad about electric cars, which they say will cost auto worker jobs, and they’re worried about the economy. That’s especially true with United Auto Workers workers striking in this state. This week, Biden joined the picket line and Trump will visit a nonunion plant.

– Analysis by Monica Potts of 538

Tonight I’ll be keeping track of DeSantis, who, despite several campaign shakeups and a steady slide in both national polls and early state surveys remains the second-place contender in the GOP primary, and who will appear at center stage this evening. DeSantis didn’t have a breakout moment last debate, though he may have been hobbled by the embarrassment of his Super PAC publicly releasing his entire debate strategy just beforehand. This time around, he may need to make a larger splash to re-convince voters he’s the best (or only) alternative to Trump. The other candidates are now nipping at his feet — he’s not even polling second in New Hampshire and South Carolina anymore — and if he becomes just another member of the pack he could lose whatever luster he has left. He’s already (started taking shots at Haley)[], who had one of the better-reviewed first debate performances and who has seen some movement in the polls. With seven candidates on stage, he’ll have limited time to make his move. Will he finally go after Trump more forcefully, or does he feel enough pressure from below to focus on Haley and the others?

—Analysis by Jacob Rubashkin, 538 contributor

I'm closely monitoring Vivek Ramaswamy. The self-proclaimed outsider made a big splash during the last debate, garnering more media attention and generating higher Google search interest than his rivals. This triggered speculation that he might experience an upswing in the polls. However, his numbers have exhibited a consistent downward trend over the last month. It's plausible that the very characteristic that initially captivated debate viewers — his confrontational and too-smart-to-be-here style of arguing — may have, ironically, alienated the average Republican voter. I'll be looking for any shifts in his rhetorical approach or substantive positions during tonight's proceedings. Like his fellow candidates, Ramaswamy needs a substantial strategic maneuver to reshape the trajectory of his campaign.

—Analysis by G. Elliott Morris

When debate moderators asked the 2024 GOP candidates about the impending government shutdown, some – including Trump’s closest opponent DeSantis – pivoted to blame the former president and current President Biden for the logjam.

Both men also called out Trump for his absence on stage, noting that he should be answering for himself as the shutdown looms.

"People in Washington are shutting down the American dream with their reckless behavior,” DeSantis said.

“And you know who else is missing an action? Donald Trump is missing an action. He should be on this stage tonight. He owes it to you to defend his record where they added 7.8 trillion to the debt that set the stage for the inflation that we have.”

Chris Christie – one of Trump’s staunchest critics – also admonished the former president.

“If the government shuts down, should voters blame populace Republicans? Very simply everybody who's in Washington, D.C.,” said Christie.

“And let's be honest about this with the voters. You know, during the Trump administration, they added $7 trillion — $7 trillion in national debt. And now the Biden administration has put another 5 trillion on and counting.”

“Donald Trump– he hides behind the walls of his golf clubs, and won't show up here to answer questions like all the rest of us are up here. He puts 7 trillion on the debt. He should be in this room to answer those questions for the people you talk about who are suffering,” Christie said.

–ABC News’ Isabella Murray