Talks between US and North Korea could fizzle without an agreement or it could result in “the greatest deal for the world” to ease nuclear tensions between the two countries, U.S. President Donald Trump said on Saturday,  Reuters reported.

“I may leave fast” if progress does not seem possible, Trump said at a campaign rally for Republican congressional candidate Rick Saccone in western Pennsylvania. Trump said he believes North Korea wants to make peace and that, “I think it’s time.”

A time and place to meet has not yet been set, although the meeting is supposed to happen by the end of May.

“Who knows what’s going to happen?” said Trump, who added that if the meeting takes place, “I may leave fast or we may sit down and make the greatest deal for the world.”

Trump made the shocking decision on Thursday to meet with Kim after the North Korean leader’s invitation was relayed by a South Korean delegation who visited the White House.