Christie criticized the idea that the president could cozy up to Vladimir Putin, noting that all recent presidents have failed to engage Putin by not being tough enough. He then hit Trump for having said that Putin was "brilliant and a great leader." As the night has worn on, Christie continues to be really the only candidate who is bothering to attack the guy who is 40 or more points ahead of every other candidate in national GOP primary polls.

— Analysis by Geoffrey Skelley of 538

Ilia Calderón is asking about sending U.S. troops to Mexico. In a late August/early September survey by Morning Consult, 41 percent of Republicans said they thought that sending U.S. troops to fight cartels in Mexico would be “very effective” at limiting the supply of illegal drugs in the United States. Other strategies had more support among Republicans, such as sending more resources to the U.S.-Mexico border (54 percent), empowering U.S. law enforcement to combat opioids (45 percent), and punishing drug violators in the United States (43 percent).
—Analysis by 538

Haley going after Ramaswamy was a recurring theme in the first debate. They were the standout candidates in our polling last time and there was a lot of speculation about Ramaswamy moving up in the polls — perhaps even surpassing DeSantis. But since August, Ramaswamy has actually lost support, to the point where Haley passed him in our polling average today. It makes sense that they're trading blows again; this seems to be a successful strategy for Haley, and Ramaswamy can't help but take the bait.
-Analysis by G. Elliott Morris of 538

The candidates are discussing support for Ukraine. About half (49 percent) of Republicans and Republican-leaning independents say that vital U.S. interests are not really at stake in the war in Ukraine, according to an August Echelon Insights survey. Thirty-seven percent disagree, saying that if Russia wins, vital U.S. interests and values are threatened. Fourteen percent are unsure.
—Analysis by 538

PolitiFact has a feature we call the Flip-O-Meter. It measures — you guessed it — flip flops.

Ramaswamy entered the flip zone when he criticized TikTok and then created an account on the platform.

"I am very open to banning TikTok outright," he wrote on X in February. "In the meantime, we sit on our hands and do nothing as kids get addicted to it like it’s digital fentanyl."

Later, on Sept. 13, Ramaswamy announced that he was joining TikTok. "Yes, kids under age 16 shouldn’t be using it, but the fact is that many young voters are & we’re not going to change this country without winning," he wrote on X. "We can’t just talk about the importance of the GOP ‘reaching young voters’ while hiding in our own echo chambers."

Ramaswamy is not the first candidate to criticize a social media platform while simultaneously using it. Massachusetts Sen. Elizabeth Warren advertised on Facebook while also saying that big tech had too much power.
-Analysis by Aaron Sharockman, PolitiFact