President Trump expressed doubt Tuesday about whether his planned June 12 summit with North Korean leader Kim Jong-un would take place.

President Donald Trump: “And, you know, there’s a chance that it will work out. There’s a chance, there’s a very substantial chance, that it won’t work out. I don’t want to waste a lot of time, and I’m sure he doesn’t want to waste a lot of time. So there’s a very substantial chance that it won’t work out. And that’s OK. That doesn’t mean it won’t work out over a period of time. But it may not work out for June 12th. But there is a good chance that we’ll have the meeting.”

That was President Trump, speaking to reporters as he welcomed South Korean President Moon Jae-in to the Oval Office. North Korea canceled recent talks with South Korea in protest of the joint U.S.-South Korea air force drills being conducted over the Korean Peninsula, which the North called a “deliberate military provocation.” Meanwhile, North Korea says it’s preparing to blow up its main nuclear weapons test site within the coming days, and has invited a handful of journalists to travel to the site to witness the detonation.