WASHINGTON (AP) — Military leaders were scrambling Thursday to devise a swift but safe departure of troops from Syria, as outraged lawmakers appealed to President Donald Trump to reverse an abrupt withdrawal order that rattled Washington's allies and was a key factor in the resignation of Defense Secretary Jim Mattis later in the day.

Defense officials said U.S. airstrikes would continue until all the approximately 2,000 U.S. troops are out of Syria, but it was unclear whether the air campaign would then end. Officials said it might depend on whether France and other coalition partners keep gr...