Secretary of State Mike Pompeo, testifying on Capitol Hill, wouldn’t comment on whether Trump’s letter blindsided the South Koreans.
The summit’s fate was thrown into question after North Korea backed away from the Trump administration’s demands to fully denuclearize. Trump then appeared to soften the demand, hinting first that he was flexible, but then saying there would be no meeting without full denuclearization.
RELATED: US-North Korea relations escalate in 1968
US-North Korea relations escalate in 1968
US-North Korea relations escalate in 1968
(Original Caption) 12/23/1968-Pammunjom, South Korea- Commander Lloyd Bucher, (L) captain of the captured U.S. intelligence ship, 'Pueblo,' leaves a press conference at a base camp near Pammunjom following his and his crew's release from North Korea after eleven months of captivity. Bucher is accompanied by U.S. Navy Public Information Officer, Captain Vince Thomas, (center), and a military policeman.
Commander Lloyd E. Bucher (left, back to the wall), commanding officer of the USS Pueblo, a Navy ship captured by North Korea in the Sea of Japan in 1968, answers questions during a naval court of inquiry. January 24, 1969. His counsel, E. Miles Harvey and Captain James E. Keyes, sit at a nearby table (right). (Photo by Nord Petersen/Library of Congress/Corbis/VCG via Getty Images)
PYONGYANG, NORTH KOREA - APRIL 20: North Korean navy ratings guard the USS Pueblo, an American spy ship, on the river Taedong in central Pyongyang 16 April 2001. The ship was attacked and captured in January 1968 and the crew held for 11 months. It has now become a symbol of a new anti-US propaganda battle. According to North Korean state media, growing numbers of people visit the ship to show their anger at US policy toward the communist state. AFP PHOTO (Photo credit should read TIM WITCHER/AFP/Getty Images)
Crew members of the US Navy spy ship 'USS Pueblo' cross the Bridge of No Return between North and South Korea, after their release into US custody, 23rd December 1968. They had been seized by North Korean forces on 23rd January of the same year. Official US Navy Photo by PH2 T. K. Reynolds, USNR. (Photo by Pictorial Parade/Archive Photos/Getty Images)
(Original Caption) Comdr. Lloyd Bucher, the Pueblo's captain, appears at a press conference in Pyongyang, North Korea, 9/12/68. At the press conference, members of the Pueblo's crew explained the ship's mission and described its capture. The newsfilm from which these pictures were made was shot by the North Korean news agency.
(Original Caption) Major General Pak Chung Kuk, North Korean Army, across table from Rear Admiral John V. Smith, U.S. Navy, during 262nd meeting of the Armistice Commission.
Korean Guard looks out window with binoculars. | Location: Pamunjom, Korea.
(Original Caption) President Johnson confers with Defense Secretary McNamara during a meeting of the National Security Council at the Executive Mansion 1/24, in this photo released by the White House. The Council discussed the seizure on the high seas of the USS Pueblo by North Korea.
(Original Caption) As the news came in that President Johnson had ordered 14,787 Air Force and Navy Reservists to active duty January 25th, William D. Jackson of Brooklyn (right) entered the US Air Force recruiting station at Times Square and talked about enlisting. Chatting with him is Technical Sgt. Steven L. Ramirez. The United States called, January 25th, for an urgent meeting of the United Nations Security Council to consider 'the grave situation' arising from the seizure of the intelligence ship 'Pueblo' by North Korea.
Algerian Ambassador to the United nations Tewfik Bouattoura (left) listens during a UN Security Council meeting addressing the international inicdent involving North Korea's capture of an alleged American spy boat, the USS Pueblo (AGER-2), New York, New York, late January 1968. (Photo by Al Fenn/The LIFE Images Collection/Getty Images)
The U.S.Aircraft carrier ENTERPRISE, 75,700 tons, the world's largest warship which carries about 100 planes, and which is reported to be sailing towards North Korea following the seizure of America's spy ship 'Pueblo' in international waters. (Photo by PA Images via Getty Images)
Officers and crew of the United States Navy ship USS Pueblo being led away after being captured by North Korean forces in international waters in the Sea of Japan during the Vietnam War.
(Original Caption) Senator J. William Fulbright (D-Arkansas), Chairman of the Senate Foreign Relations Committee, following a 3-hour meeting of his committee 1/24, said a decision on whether to order a full scale investigation into the Tonkin Gulf attack had been postponed. Fulbright said he felt the Administration should 'be very careful' in its response to North Korea's seizure of the USS Pueblo.
NORTH KOREA - JANUARY 01: North Korea. Discovery of weapons and bodies of a United Nations commando force which entered illegally into North Korea. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
(Original Caption) 1/2/1968-Along the Western Truce Front, Korea- U.S. troops manning the western tip of 151-mile Korean truce front have recently completed a 15-mile fence as part of a new security system along the Korean Demilitarized Zone. Constructed of iron poles and barbed wire, the fence- it is hoped -will keep North Koreans from smuggling agents into the South.
Commander Lloyd Bucher is greeted by his wife, Cindy, upon returning from captivity in North Korea. He and his crew aboard the USS Pueblo were captured in January 1968. (Photo by James L. Amos/Corbis via Getty Images)
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Trump’s national security adviser John Bolton and Vice President Mike Pence sparked further North Korean outrage with comments comparing North Korea with Libya.
“Sadly, 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 wrote in a letter to Kim shared with reporters on Thursday.