Singapore summit

A person passes by a bouquet of Workers Party flags along a main street of the Central District in Pyongyang, North Korea, last week. Jon Chol Jin/AP hide caption

North Korea leader Kim Jong Un and President Trump shake hands at the conclusion of their meetings at the Capella resort on Sentosa Island, in Singapore, on June 12. Susan Walsh/AP hide caption

National security adviser John Bolton, center, and President Trump's chief of staff John Kelly, right, attend a Cabinet meeting in the White House, Tuesday, last month. Andrew Harnik/AP hide caption

This July 22 satellite image, released and annotated by 38 North on Monday, shows what the U.S. research group says is the partial dismantling of the rail-mounted transfer structure (center) at the Sohae launch site in North Korea. Airbus Defense & Space/38 North via AP hide caption

A photo taken in February 2017 and released by North Korea's official Korean Central News Agency (KCNA) shows the launch of the solid-fuel medium long-range ballistic missile Pukguksong-2 at an undisclosed location. AFP/Getty Images hide caption

A photo of President Trump and North Korean leader Kim Jong Un is on display as a member of People's Democratic Party stands in opposition of military exercises between the United States and South Korea near the U.S. embassy in Seoul on Tuesday. Ahn Young-joon/AP hide caption

White House chief economic adviser Larry Kudlow speaks during a television interview outside the West Wing of the White House on May 18. President Trump tweeted that Kudlow suffered a heart attack and is hospitalized at Walter Reed Medical Center. Carolyn Kaster/AP hide caption