Ramswamy defended his position that the U.S. should arm the Taiwanese people with assault-style weapons, despite a Taiwanese zero-gun policy, and added the U.S. should “for the foreseeable future” promise to defend the self-governing island from China, which claims it as its own.

Ramaswamy drew a contrast with DeSantis, who hewed closer to the strategic ambiguity behind America’s longstanding deterrence posture. Haley, separately, said America must continue to defend Ukraine as a signal to Beijing that it can’t attack Taiwan and said the U.S. should not depend on China for national security.

Christie said he would engage militarily if Taiwan is invaded by China.

-ABC News’ Chris Boccia

Asked what threats she worries could blindside the U.S. amid what federal officials have called a heightened threat level during the Israel-Hamas war, Haley focused on "foreign infiltration."

"America right now is acting like it's Sept. 10. We better remember what Sept. 12 felt like, because it only takes one," she said.

"We've got to get the foreign infiltration out of our country -- whether it's in our schools, whether it's on our social media, we need to stop all foreign lobbying that's happening to members of Congress, and we need to start securing America again," she continued.

-ABC News' Meredith Deliso

Ramaswamy again trained his ire toward Haley, with whom he has feuded across the debates this year, saying she was “woke” and “had a corruption problem.” Ramaswamy raised a notepad which had the message “NIKKI=CORRUPT.” A chorus of boos filled the venue.

The entrepreneur said Haley would “send your kids to die so she can buy a bigger house.”

Given the chance to respond, Haley said only, “No. It’s not worth my time to respond to him.”

- ABC News’ Chris Boccia

In that question, Tom Fitton just pointed out, incredulously, that the U.S. Postal Service is more popular than the FBI. But this actually isn’t surprising -- the Postal Service is quite popular! According to a 2023 poll from the Pew Research Center, 77% of Americans have a favorable view of the Postal Service. It’s the second-most popular federal agency, after the National Park Service.
-Analysis by Nathaniel Rakich of 538

It's been four weeks since Republican primary contenders last met on stage. A lot has happened between then and now.

Two candidates dropped out of the race: South Carolina Sen. Tim Scott and North Dakota Gov. Doug Burgum.

Their exits whittled down the field down to five major candidates, though Trump remains the front-runner with two candidates now vying for second place in the polls: DeSantis and Haley. All three recently received notable endorsements with voting just weeks away. The Koch-backed group Americans for Prosperity Action threw its support behind Haley over Trump while DeSantis has earned key endorsements in Iowa, including from Gov. Kim Reynolds and Trump, despite his absence, just got the backing of Alabama Sen. Katie Britt.

This is the last chance for candidates to get a boost on the national stage before next month's Iowa caucuses and the New Hampshire primary.

-ABC News' Alexandra Hutzler