Protesters burn security post at U.S. Embassy in Iraq in new foreign policy test for Trump

BAGHDAD/WASHINGTON (Reuters) - Protesters angry about U.S. air strikes on Iraq hurled stones and torched a security post at the U.S. Embassy in Baghdad on Tuesday, setting off a confrontation with guards and posing a new challenge for U.S. President Donald Trump.The protests, led by Iranian-backed militias, prompted the United States to deploy additional U.S. Marines to protect embassy personnel who were huddled inside the facility.Trump threatened to retaliate against Iran.