WASHINGTON (AP) — President Joe Biden has ordered retaliatory airstrikes against Iranian-backed militia groups after three U.S. servicemembers were injured in a drone attack in northern Iraq. National Security Council spokeswoman Adrienne Watson said one of the U.S. troops suffered critical injuries in the attack that occurred earlier Monday. The Iranian-backed militia Kataib Hezbollah and affiliated groups, under an umbrella of Iranian-backed militants, claimed credit for the attack. Biden, who is spending Christmas at the presidential retreat at Camp David, Maryland, was briefed on the attack on Monday and ordered the Pentagon to prepare response options.