The Biden administration is vowing to continue its military action against Iranian-backed militia groups, as Secretary of State Antony Blinken embarks on his fifth trip to the Middle East since October. National security adviser Jake Sullivan said the strikes on Houthi targets in Yemen and militias in Iraq and Syria are “the beginning of our response” to the killing of three U.S. soldiers in Jordan. Asked by reporters whether the retaliation was working, President Biden said: “Yes!”