North Korea didn't show up to recent meetings to prepare for the now-cancelled summit between dictator Kim Jong Un and President Trump, the White House revealed Thursday.

The summit, from which the U.S. withdrew Thursday morning, was scheduled to take place June 12 in Singapore.

North Korean leadership didn't show up to a recent planning meeting by Trump administration officials in Singapore, a senior White House official said, adding that the U.S. made several attempts to communicate with North Korea ahead of what would have been an historic meeting but leadership from the communist nation never responded.

"They stood us up," the official said.

North Korea's statement to the U.S. Wednesday night -- in which the country threatened to pull out of the summit and called Vice President Mike Pence a "political dummy" -- was the first communication the U.S. has heard from the North in a week, the White House said.

"Based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long-planned meeting," Trump stated in a letter to Kim released on Thursday.

READ THE LETTER: TRUMP'S MESSAGE TO KIM JONG UN THAT CANCELED HISTORIC SUMMIT

However, Trump left open the possibility of rescheduling the summit, saying that "hopefully everything is going to work out well with North Korea. A lot of things can happen, including the fact — it’s possible the existing summit could take place, or a summit at a later date.”

Fox News' Brooke Singman contributed to this report.