American and North Korean officials met at the border between North and South Korea on Sunday in preparation for a possible North Korea-U.S. summit, as North Korea's Kim Jong Un was cited as reaffirming his commitment to meet with U.S. President Donald Trump.

Both Pyongyang and Washington are pressing ahead on plans for a summit after Trump pulled out of the proposed June 12 meeting on Thursday, only to reconsider the decision the next day.

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"A U.S. delegation is in ongoing talks with North Korean officials at Panmunjom," spokeswoman Heather Nauert said, referring to a village in the Demilitarized Zone (DMZ) that runs along the heavily armed border between North and South Korea.

"We continue to prepare for a meeting between the President and North Korean leader Kim Jong Un," she said in a statement.

In addition to the border talks, White House spokeswoman Sarah Sanders said a "pre-advance team" left for Singapore on Sunday morning to work on logistics for a possible summit.

Earlier on Sunday, South Korean President Moon Jae-in said he and North Korea's Kim had agreed during a surprise meeting on Saturday that the North Korea-U.S. summit must be held.

The weekend meetings were the latest dramatic turn in a week of diplomatic ups and downs over the prospects for an unprecedented summit between the United States and North Korea, and the strongest sign yet that the leaders of the two Koreas are trying to keep the meeting on track.