Biden faces pressure to strike Iran after US troops killed

President Joe Biden speaks at the First in the Nation Celebration held by the South Carolina Democratic Party at the State Fairgrounds, Saturday, Jan. 27, 2024, in Columbia, S.C. (AP Photo/Artie Walker Jr.)

The killing of three US troops and wounding of dozens more on Sunday by Iran-backed militants is piling political pressure on President Joe Biden to deal a blow directly against Iran, a move he's been reluctant to do out of fear of igniting a broader war.

Biden's response options could range anywhere from targeting Iranian forces outside to even inside Iran, or opting for a more cautious retaliatory attack solely against the Iran-backed militants responsible, experts say.