“He also knows that I am with him & does not want to break his promise to me," Trump wrote.

Trump sent the tweet shortly after North Korea fired multiple short-range projectiles off its east coast on Saturday morning.

Klobuchar said on Sunday that she would "always be willing to meet with leaders to discuss policies" when Tapper asked if she would sit down with Kim as president.

"But my problem with how President Trump has handled this is not that he’s had meetings," Klobuchar said. "It’s that there isn’t a plan and there isn’t a real negotiation tactic and he’s not working with our allies as he should."

Negotiations between Pyongyang and Washington are ongoing after Trump and Kim's second summit in Vietnam in February did not result in a deal.