Ramaswamy introduced himself to a national audience from center stage, arguing that an outsider is needed to move America forward.

"First, let me just address a question that is on everybody's mind at home tonight: Who the heck is this skinny guy with a funny last name and what the heck is he doing in the middle of this debate stage? I'll tell you, I'm not a politician. Bret, you're right about that. I'm an entrepreneur," Ramaswamy told co-moderator Bret Baier.

"Now is our moment to start running to something to our vision of what it means to be an American today. If you have a broken car, you don't turn over the keys to the people who broke it again. You hand it over to a new generation to actually fix the problem. That's why I'm in this race, and we're just getting warmed up."

In his response on how to steady the economy, Christie pointed to his record taking on debt in New Jersey and argued he could do the same in to "fight waste" in Washington -- invoking a cut-the-spending mentality that has long been popular among conservatives but became less prominent with Trump's rise, as he focused on other initiatives.

"We cannot sit by any longer and allow the kind of spending that is going on in Washington," Christie said. "Every dollar they spend is a dollar that these people are not allowed to spend on their children and grandchildren. It is robbing our country and it is wrong."

Scott also jumped on government spending as a major problem, touting his votes against legislation by Democrats.

"Over the last several years, I've had an opportunity to vote against spending package after spending package after spending package," Scott said. "And we also need to understand is that Joe Biden's Bidenomics has led to the loss of $10,000 of spending power for the average family."

Interesting early questions by the Fox News hosts. DeSantis got to go first, understandably, and he didn't face any questions about his tenure as governor. By comparison, when the hosts turned to Christie and Scott, they faced questions about state debate in Christie's case and Scott's voting record on spending bills. Both seemed caught a little off balance by actual scrutiny of their records.
-Analysis by Geoffrey Skelley of FiveThirtyEight

Interesting early questions by the Fox News hosts. DeSantis got to go first, understandably, and he didn't face any questions about his tenure as governor. By comparison, when the hosts turned to Christie and Scott, they faced questions about state debate in Christie's case and Scott's voting record on spending bills. Both seemed caught a little off balance by actual scrutiny of their records.

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