At a political rally in Pennsylvania, Mr. Trump told supporters he believed North Korea wanted to make peace.
But he said he might leave the talks quickly if it didn’t look like progress for nuclear disarmament could be made.
In his speech, the US leader warned of tariffs on European cars, and launched his slogan for re-election in 2020.
In his wide-ranging speech, he said he hoped a deal to ease nuclear tensions would happen, particularly to help countries like North Korea.
He also said he believed the North Koreans would honor their commitment not to test any more missiles. Mr. Trump told the crowd: “I think they want to make peace, I think it’s time.”
No date or place has been set for the meeting, despite initial reports it would happen by the end of May.
South Korea’s presidential office said the North Korean truce village of Panmunjom, which sits at the demilitarized zone between the North and the South, was a “serious” option.