Ramaswamy and Haley traded shots on his Israel and Russia-Ukraine views, with Ramaswamy interrupting Haley and claiming she has been saying misleading things about his proposals on Israel. Ramaswamy has called for winding down aid to Israel after integrating the country more into the region.

"I wish you well on your future career on the boards of Lockheed and Raytheon,” Ramaswamy quipped, referring to the aerospace and defense companies.

Haley struck back: "You have no foreign policy experience and it shows," she said -- and was met with cheers and applause from the audience.

-ABC News’ Abby Cruz

Trump wasted no time attacking other Republican candidates during his pre-taped interview with former Fox News host Carlson.

"I'm saying, do I sit there for an hour or two hours, whatever it's going to be and get harassed by people that shouldn't even be running for president?" Trump said.

The 46-minute interview -- released on Carlson's X account as the GOP debate got underway -- is being seen among the campaigns as an attempt to counter-program the first debate among 2024 Republican presidential candidates on Fox News.

Read more about the interview here.

-ABC News' Lalee Ibssa , Soo Rin Kim and Meredith Deliso

DeSantis expressed support for using the U.S. military to combat drug cartels across the border.

"The president of the United States has to use all available powers as commander in chief to protect our country and the people," DeSantis said.

"When they are coming across, yes we are going to use lethal force," he continued -- a line he's used repeatedly throughout the campaign.

Activists have pushed back that his plan is inhumane and illegal.

-ABC News' Alexandra Hutzler

Martha MacCallum just asked about what to do about migrants already in the United States. In a July poll by The New York Times/Siena College, 39 percent of likely Republican voters say that they supported a “comprehensive immigration reform bill that provides a pathway to citizenship for all undocumented immigrants” in the United States, while 57 percent opposed such a bill. Support was weakest among Trump supporters (29 percent) compared with DeSantis supporters (48 percent) and voters who say they will vote for another candidate (50 percent).
-Analysis by FiveThirtyEight

I was watching DeSantis tonight, and overall I think he did well. Despite perhaps underestimating the strength of his mic (he came across several times like he was yelling), DeSantis came across as confident and didn’t have any of the awkward moments that have gotten him bad attention on the campaign trail. In terms of substance, he turned the conversation toward issue areas that play to his strengths, like COVID-19, wokeness in education and natural disaster leadership.

That said, according to our FiveThirtyEight/Washington Post/Ipsos poll, Republicans already had pretty high expectations for DeSantis in this debate, so maybe his good performance won’t change their priors. (We’ll have to wait for the second wave of our poll to know for sure!) Really what I’m watching for after this debate is what happens to Ramaswamy. Like I wrote earlier, I think he’s the main story of this debate, but I don’t think I have a good handle on whether his performance will be received well or poorly.

-Analysis by Nathaniel Rakich of FiveThirtyEight