Donald Trump speaks at a campaign rally on Monday in Manchester, N.H. (Photo by Jabin Botsford/The Washington Post)

GREENVILLE, S.C. -- Donald Trump said Wednesday that if he is elected president, he would address North Korea's experimentation with nuclear weapons by pushing China to make the country's leader, Kim Jong Un, "disappear."

“I would get China to make that guy disappear in one form or another very quickly,” Trump said in a rare in-studio interview on CBS's This Morning on Wednesday.

Norah O’Donnell, a co-host of the show, asked Trump what he meant by that and if he was calling for an assassination of North Korea's leader.

“Well, you know, I’ve heard of worst things, frankly,” Trump said. “I mean, this guy is a bad dude. And don’t underestimate him."

O'Donnell asked why the United States wouldn't address North Korea itself, and Trump said China needs to do so because they already have control over the country. Trump said he would force China into action using economic sanctions.

"China has control -- absolute control -- of North Korea," Trump said. "They don't say it, but they do, and they should make that problem disappear."