Military and defense

President Donald Trump speaks about American missile defense doctrine, Thursday, Jan 17, 2019, at the Pentagon. (AP Photo/ Evan Vucci)

President Donald Trump speaks about American missile defense doctrine, Thursday, Jan 17, 2019, at the Pentagon. (AP Photo/ Evan Vucci)

From left, Kim Yong Chol, a North Korean senior ruling party official and former intelligence chief, Secretary of State Mike Pompeo, and U.S. Special Representative for North Korea Stephen Biegun, arrive to pose for photographs at the The Dupont Circle Hotel in Washington, Friday, Jan. 18, 2019. (AP Photo/Carolyn Kaster)

This Monday, Jan. 14, 2019 photo released by U.S. Customs and Border Protection shows some of 376 Central Americans the Border Patrol says it arrested in southwest Arizona, the vast majority of them families, who used short holes dug under a barrier to cross the border in multiple spots about 10 miles east of San Luis, Ariz. The unusually large group was almost entirely from Guatemala. (U.S. Customs and Border Protection via AP)

This photo provided by the U.S. Navy shows Navy Chief Cryptologic Technician (Interpretive) Shannon M. Kent, 35, of Pine Plains, N.Y. Kent was killed in a suicide bomb attack claimed by the Islamic State group in Syria, Wednesday, Jan. 16, 2019. Pentagon officials say four Americans killed in the northern Syrian town of Manbij. The attack also wounded three U.S. troops and was the deadliest assault on U.S. troops in Syria since American forces went into the country in 2015. (U.S. Navy via AP)

President Donald Trump speaks about American missile defense doctrine, Thursday, Jan 17, 2019, at the Pentagon. (AP Photo/ Evan Vucci)

FILE - In this Jan. 9, 2019, file photo, a man throws a ball for his dog next to the border wall topped with razor wire in Tijuana, Mexico. In his demands that Congress set aside $5.7 billion for a border wall, President Donald Trump insists a physical barrier would stop heroin entering the U.S. from Mexico. But U.S. statistics, analysts and testimony at the trial of drug kingpin Joaquin "El Chapo" Guzman in New York show that most hard drugs entering the U.S. from Mexico come through land ports of entry staffed by agents, not open sections of the border. (AP Photo/Gregory Bull, File)