But this time, the US will need to consider whether to hold Iran itself responsible. It’s an option, and an escalation, fraught with significant risk. Since then, US forces have come under attack more than 150 times by Iran-backed groups in Iraq and Syria, causing at least 70 casualties prior to Sunday’s attack, most of them traumatic brain injuries. US warships have also been fired at by Iran-backed Houthi forces in Yemen, House Speaker Mike Johnson, R-La., wrote on X, formerly Twitter.But Republican lawmakers on Sunday spoke out to criticize President Joe Biden’s approach to Iran and some called for direct action against the country.”Heartbroken and outraged by the death of three U.S. service members and the wounding of many others during the horrific terrorist attack in the Middle East.