Marco Rubio, Ted Cruz and John Kasich all pledged to support the eventual nominee. And Trump, who has occasionally threatened to mount an independent bid, also vowed, “Yes, I will” support the nominee.

The moment of unity in Detroit was a break from the otherwise tense and personal debate. At other times, the Republican front-runner repeatedly was challenged, by the moderators and his rival candidates, on his alleged inconsistencies.

Trump defended his statements, one after another – for instance, saying “I changed my tune” from welcoming Middle East refugees to suggesting the U.S. can’t take them, after learning new information.

“I have a very strong core,” he said, while adding: “I have never seen a successful person who wasn’t flexible.”

But his rivals argued this “flexibility” raises questions about whether Trump really would deliver on his promises.

“There’s a difference between flexibility and telling people whatever you think you need to say to get them to do what you want them to do,” Rubio charged, claiming once again that Trump is “trying to con people.”

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