President Trump arrives at Dover Air Force Base

President Donald Trump departs Dover Air Force Base after meetings with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump departs Dover Air Force Base after meetings with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump boards Air Force One at Andrews Air Force Base, Md., Saturday, Jan. 19, 2019, to travel to Dover Air Force Base, Del. (AP Photo/Andrew Harnik)

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump at Dover Air Force Base for a dignified transfer for Scott A. Wirtz who was one of four U.S. service members killed in an attack in Syria.

President Donald Trump at Dover Air Force Base for a dignified transfer for Scott A. Wirtz who was one of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump at Dover Air Force Base for a dignified transfer for Scott A. Wirtz who was one of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

Officals wait for stairs to be placed as President Donald Trump arrives on Air Force One at Dover Air Force Base, Del., Saturday, Jan. 19, 2019, to pay tribute to the four Americans killed in a suicide bomb attack in Syria as their remains are returned.(AP Photo/Andrew Harnik)

President Donald Trump at Dover Air Force Base for a dignified transfer for Scott A. Wirtz who was one of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives on Air Force One at Dover Air Force Base, Del., Saturday, Jan. 19, 2019, to pay tribute to the four Americans killed in a suicide bomb attack in Syria as their remains are returned. Following Trump is Secretary of State Mike Pompeo. (AP Photo/Andrew Harnik)

President Donald Trump greets Chief Master Sgt. Anthony W. Green Command Chief Master Sergeant, 436th Airlift Wing at Dover Air Force Base, Del., Saturday, Jan. 19, 2019, as he arrives to pay tribute to the four Americans killed in a suicide bomb attack in Syria as their remains are returned as Chief Master Sgt. Danielle M. Hirvela, Chief Enlisted Manager, Air Force Mortuary Affairs Operations, third from right, and Secretary of State Mike Pompeo and acting Secretary of Defense Patrick Shanahan, right, watch. (AP Photo/Andrew Harnik)

President Donald Trump boards Air Force One at Andrews Air Force Base, Md., Saturday, Jan. 19, 2019, to travel to Dover Air Force Base, Del. (AP Photo/Andrew Harnik)

President Donald Trump walks to board Air Force One at Andrews Air Force Base, Md., Saturday, Jan. 19, 2019, to travel to Dover Air Force Base, Del. (AP Photo/Andrew Harnik)

As President Donald Trump and Secretary of State Mike Pompeo, right, watch, a U.S. Navy carry team moves a transfer case containing the remains of Scott A. Wirtz, Saturday, Jan. 19, 2019, at Dover Air Force Base, Del. According to the Department of Defense, Wirtz, a civilian and former Navy SEAL from St. Louis, Mo., was killed Jan. 16, 2019, in a suicide bomb attack in Manbij, Syria. (AP Photo/Andrew Harnik)

President Donald Trump salutes as a U.S. Navy carry team moves a transfer case containing the remains of Scott A. Wirtz, Saturday, Jan. 19, 2019, at Dover Air Force Base, Del. According to the Department of Defense, Wirtz, a civilian and former Navy SEAL from St. Louis, Mo., was killed Jan. 16, 2019, in a suicide bomb attack in Manbij, Syria. (AP Photo/Patrick Semansky)

President Donald Trump, front row from left, Secretary of State Mike Pompeo, acting Secretary of Defense Patrick Shanahan, Secretary of the Army Mark Esper, Director of the Defense Intelligence Agency Lt. Gen. Robert Ashley, and Col. Dawn C. Lancaster, Commander Air Force Mortuary Affairs, and other members of the official party stand at attention as a U.S. Navy carry team moves a transfer case containing the remains of Scott A. Wirtz, Saturday, Jan. 19, 2019, at Dover Air Force Base, Del. According to the Department of Defense, Wirtz, a civilian and former Navy SEAL from St. Louis, Mo., was killed Jan. 16, 2019, in a suicide bomb attack in Manbij, Syria. (AP Photo/Patrick Semansky)

A U.S. Navy carry team salutes the transfer case containing the remains of Scott A. Wirtz as it is loaded into a vehicle, Saturday, Jan. 19, 2019, at Dover Air Force Base, Del. According to the Department of Defense, Wirtz, a civilian and former Navy SEAL from St. Louis, Mo., was killed Jan. 16, 2019, in a suicide bomb attack in Manbij, Syria. (AP Photo/Andrew Harnik)

President Donald Trump walks onto a C-17 as the remains of four Americans killed in a suicide bomb attack in Syria are returned to Dover Air Force Base, Saturday, Jan. 19, 2019. (AP Photo/Andrew Harnik)

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.

President Donald Trump arrives at Dover Air Force Base to meet with relatives of four U.S. service members killed in an attack in Syria.