A man watches a television news screen reporting latest developments on North Korea's missile launch as the screen shows file footage, at a railway station in Seoul on October 2, 2019. (Photo by JUNG YEON-JE/AFP via Getty Images)
U.S. President Donald Trump waits to congratulate graduates during the 2019 graduation ceremony at the United States Air Force Academy in Colorado Springs, Colorado, on May 30.
U.S. President Donald Trump gestures as he returns to the White House after attending the United Nations General Assembly on September 26, 2019 in Washington, DC. (Photo by Mark Wilson/Getty Images)
U.S. Secretary of State Mike Pompeo listens as President Donald Trump holds a press conference on the sidelines of the U.N. General Assembly in New York on Sept. 25.
U.S. President Donald Trump and Ukrainian President Volodymyr Zelensky speak on the sidelines of the United Nations General Assembly in New York on Sept. 25.
Visitors gather at Tehran's Islamic Revolution and Holy Defense museum during the unveiling of an exhibition of what Iran says are U.S. and other drones captured in its territory, in the capital Tehran on Sept. 21, 2019.
U.S. Secretary of Defense Mark Esper and Chairman of Joint Chiefs of Staff Joseph Dunford hold a media briefing at the Pentagon in Arlington, Virginia, on Aug. 28.
U.S. Secretary of State Mike Pompeo takes part in a meeting with Saudi Arabia's Crown Prince Mohammed bin Salman in Jeddah, Saudi Arabia on September 18, 2019.