President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Sunday said there is a chance that nuclear negotiations with North Korea will be unsuccessful, while criticizing past administrations on the issue.

Trump in the first of two tweets initially mocked "Meet the Press'" host Chuck Todd, whom the president has labeled "sleepy eyes."

"Sleepy Eyes Chuck Todd of Fake News NBC just stated that we have given up so much in our negotiations with North Korea, and they have given up nothing," Trump tweeted. "Wow, we haven’t given up anything & they have agreed to denuclearization (so great for World), site closure, & no more testing!"

"We are a long way from conclusion on North Korea, maybe things will work out, and maybe they won’t - only time will tell," he added in a second tweet. "But the work I am doing now should have been done a long time ago!"

Sleepy Eyes Chuck Todd of Fake News NBC just stated that we have given up so much in our negotiations with North Korea, and they have given up nothing. Wow, we haven’t given up anything & they have agreed to denuclearization (so great for World), site closure, & no more testing! — Donald J. Trump (@realDonaldTrump) April 22, 2018

....We are a long way from conclusion on North Korea, maybe things will work out, and maybe they won’t - only time will tell....But the work I am doing now should have been done a long time ago! — Donald J. Trump (@realDonaldTrump) April 22, 2018

Todd expressed skepticism about the negotiations earlier Sunday morning on NBC's "Today" show, saying that North Korean leader Kim Jong Un is not actually "giving" very much to the U.S.

“[Kim] seems to be giving very little but making it seem like he’s giving a lot, and he’s giving off a tone of cooperation,” Todd said. “Look, the tone in itself obviously is a positive development.”

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North Korea last week announced it would halt nuclear and missile tests, as well as shutter a nuclear test site. Pyongyang declined, however, to give up its nuclear weapons program entirely.

Trump is preparing to meet with Kim. The meeting, which is expected to take place sometime in the next two months, would be the first of its kind between a North Korean leader and a sitting U.S. president.

— This report was updated at 12:31 p.m.