"The United States on Wednesday attributed the drone attack that killed three U.S. service members in Jordan to the Islamic Resistance in Iraq, an umbrella group of Iran-backed militias, as President Joe Biden weighs his options to respond to the strike. Iran threatened to “decisively respond” to any U.S. attack on the Islamic Republic after the U.S. said it held Tehran responsible. The U.S. has signaled it is preparing for retaliatory strikes in the Mideast in the wake of the Sunday drone attack that also wounded more than 40 troops at Tower 22, a secretive base in northeastern Jordan that’s been crucial to the American presence in neighboring Syria."