"I always believe in talking," Trump said Saturday when asked if he would speak to Kim by phone. "We have a very firm stance — look, our stance, you know what it is. We're very firm, but ... absolutely I would do that."

When asked whether there would be no prerequisites, the president responded: "That's not what I said at all."

Trump, speaking to reporters after a meeting at Camp David, claimed credit for announced talks between North and South Korea that are to include discussions about the PyeongChang Winter Olympics.

"Right now they're talking Olympics. It's a start. It's a big start," Trump said. "If I weren't involved, they wouldn't be talking about Olympics right now." Trump has made similar statements on Twitter this week. There has been speculation that Kim used the prospect of talks to drive a wedge between South Korea and the United States.

Tensions have risen between Trump and Kim over North Korea's ballistic missile and nuclear weapons program, and a nuclear test which North Korea conducted in September.

Kim in a New Year's Day address boasted that the United States is within range of its nuclear weapons and "a nuclear button is always on my desk." Trump responded on Twitter this week that "I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!"

Trump said Saturday of Kim: "He knows I'm not messing around. I'm not messing around. Not even a little bit, not even one percent. He understands that." But Trump said the U.S. is working on a peaceful solution.

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