DOVER AIR FORCE BASE, Del. (AP) — A solemn procession. A long salute. A chaplain's prayer.

President Donald Trump traveled to Delaware's Dover Air Force Base on Saturday to pay his respects to the returning remains of four Americans who were killed this week in a suicide bomb attack in Syria.

The bombing, which was the deadliest assault on U.S. troops in Syria since American forces moved into the country in 2015, came as Trump prepares to pull U.S. troops out of Syria. And it underscored the threat still posed by Islamic State militants, even as Trump has claimed the group's defeat.

The presid...