Military and defense

House Intelligence Committee Chairman Adam Schiff, D-Calif., takes a reporter's question as Speaker of the House Nancy Pelosi, D-Calif., announces impeachment managers before sending articles of impeachment to the Senate charging President Donald Trump for abuse of power and obstruction of Congress, at the Capitol in Washington, Wednesday, Jan. 15, 2020. (AP Photo/J. Scott Applewhite)

In this Jan. 10, 2020, photo, people work at a portion of border wall which is under construction in Yuma, Ariz. Illegal border crossings have plummeted as the Trump administration has extended a policy to make asylum seekers wait in Mexico for court hearings in the U.S. (AP Photo/Elliot Spagat)

President Donald Trump waves before getting into his vehicle after arriving at Palm Beach International Airport in West Palm Beach, Fla., Friday, Jan. 17, 2020. Trump and his family are spending the weekend at their Mar-a-Lago estate. (AP Photo/Susan Walsh)

In this Jan. 15, 2020, photo, Sen. Susan Collins, R-Maine, talks to reporters on Capitol Hill in Washington. In the dawn of what may be her toughest reelection fight, veteran Collins has parachuted into familiar terrain _ the pressure-packed middle of an issue, this time the impeachment of President Donald Trump. (AP Photo/Susan Walsh)

FILE - In this Dec. 20, 2019 file photo, Defense Secretary Mark Esper speaks during a news conference at the Pentagon in Washington. After the Pensacola shooting, Defense Secretary Mark Esper ordered a review of the Pentagon's handling of foreign military trainees. The results, announced Friday, put foreign trainees under new limitations, including their travel away from their assigned base; their possession and use of firearms and their access to bases and other U.S. facilities. (AP Photo/Susan Walsh)

FILE - In this June 3, 2014, image provided by the U.S. Navy, Navy Capt. John R. Nettleton, then-commanding officer of Naval Station Guantanamo Bay, Cuba, speaks during a Battle of Midway commemoration ceremony. Nettleton was convicted Friday, Jan. 17, 2020 of interfering with an investigation into the death of a civilian with whom the commander had fought and argued over his alleged affair with the man's wife. A federal jury in Jacksonville convicted Nettleton on charges of obstruction of justice, concealing material facts, falsifying records and making false statements.(Mass Communication Specialist 3rd Class Jacob Goff/U.S. Navy via AP)

Defense Secretary Mark Esper speaks during a joint news conference with Japan's Defense Minister Taro Kono at the Pentagon in Washington, Tuesday, Jan. 14, 2020. (AP Photo/Manuel Balce Ceneta)

In this photo released by an official website of the office of the Iranian supreme leader, Supreme Leader Ayatollah Ali Khamenei delivers his sermon in the Friday prayers at Imam Khomeini Grand Mosque in Tehran, Iran, Friday, Jan. 17, 2020. Iran's supreme leader said President Donald Trump is a "clown" who only pretends to support the Iranian people but will "push a poisonous dagger" into their backs, as he struck a defiant tone in his first Friday sermon in Tehran in eight years. (Office of the Iranian Supreme Leader via AP)

Libyan Gen. Khalifa Hifter, right, and Greek Foreign Minister Nikos Dendias shake hands before their meeting in Athens, Friday, Jan. 17, 2020. The commander of anti-government forces in war-torn Libya has begun meetings in Athens in a bid to counter Turkey's support for his opponents. (AP Photo/Thanassis Stavrakis)