Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE on Thursday night defended his changes in positions and argued the need for flexibility.

"I’ve never seen a successful person who wasn’t flexible and who didn’t have a certain degree of flexibility," Trump said at GOP debate in Michigan.
 
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"You have to be flexible because you learn," Trump added. "If you're going to be one way and you think it's wrong, does that mean the rest of your life you have to go in the wrong direction because you don't want to change?"
 
Fox News debate moderator Megyn Kelly played a clip showing several examples where Trump changed his position regarding keeping U.S. troops in Afghanistan and resettling Syrian refugees in the U.S.
 
Trump, who's called for a temporary ban of Muslims from entering the country, had previously said in an interview that he would permit refugees to come into the United States.
 
The GOP front-runner on Thursday clarified that he switched positions once the number was increased to thousands and called for building "safe zones" where refugees can remain in their own country.
 
"When they were talking about thousands and thousands, I changed my tune, and I don’t think there’s anything wrong about that," Trump said.