Trump-Kim summit

President Donald Trump meets with North Korean leader Kim Jong Un on Sentosa Island on June 12, 2018, in Singapore.

U.S. President Donald Trump shakes hands with North Korea leader Kim Jong Un at the Capella resort on Sentosa Island on June 12, 2018, in Singapore.

U.S. President Donald Trump holds up the document that he and North Korea leader Kim Jong Un just signed at the Capella resort on Sentosa Island on June 12, 2018, in Singapore.

North Korea’s leader Kim Jong Un, left, shakes hands with President Donald Trump at the start of their historic summit at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Donald Trump and Kim Jong Un have become the first sitting U.S. and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear standoff.

North Korean journalists film the motorcade of North Korea leader Kim Jong Un as they leave the St. Regis Hotel on the way to the Capella Hotel in Singapore on June 12, 2018, where the summit between Kim and U.S. President Donald Trump will take place.

U.S. President Donald Trump answers questions about the summit with North Korea leader Kim Jong Un during a press conference at the Capella resort on Sentosa Island on June 12, 2018, in Singapore.

John Miller, of Manchester, N.H., a former U.S. Army sergeant who served as a forward radio relay operator in Vietnam, watches as President Donald Trump shakes hands with North Korean leader Kim Jong Un while having a beer at the American Legion Post #2 in Manchester on June 11, 2018.

People watch a TV screen showing U.S. President Donald Trump meet with North Korean leader Kim Jong Un during a news program at the Seoul Railway Station in Seoul, South Korea, on June 12, 2018.