Trump pledges retaliation after 3 Americans are killed in Syria attack that the US blames on IS

Trump says 'we will retaliate' after 3 Americans are killed in Syria attack that the US blames on Islamic State group.
NBC Los Angeles

2 U.S. service members and one American civilian killed in ambush in Syria, U.S. Central Command says

The U.S. has hundreds of troops deployed in eastern Syria as part of a coalition fighting the Islamic State group.