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 spoke to South Korean President Moon Jae-In about the upcoming talks with North Korea following Pyongyang's threats to withdraw from the summit.

“The two leaders will work closely and unwaveringly for the successful hosting of the North Korea- U.S. summit set on June 12, including the upcoming South Korea-U.S. summit,” said the presidential official of South Korea, as reported by Reuters.

The conversation between Trump and Moon comes after North Korea suggested last week that it may not participate in the June 12 summit between Kim and Trump if the United States continues to pursues “unilateral” nuclear disarmament.

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Trump is slated to meet with Kim in Singapore to discuss North Korea’s nuclear program.

“He will get protections that are very strong,” Trump said last Thursday from the Oval Office. “The best thing he could do is make a deal.”

North Korea last week also reportedly suggested the United States’ military drills with South Korea could jeopardize the June summit.

"The United States will also have to undertake careful deliberations about the fate of the planned North Korea-U.S. summit in light of this provocative military ruckus jointly conducted with the South Korean authorities," said North Korea's Korean Central News Agency in a statement reported by South Korea’s Yonhap News Agency.