President Joe Biden on Friday said the airstrikes the United States carried out in Syria this week sent a message to the Iranian regime. “You can’t act with impunity,” he told reporters about the message while touring a facility in Houston, Texas. After a pause, he added, “Be careful.” White House press secretary Jen Psaki, speaking to reporters on board Air Force One en route to Texas earlier in the day, said that Biden was “sending an unambiguous message that he’s going to act to protect Americans.” “And when threats are posed, he has the right to take an action at the time and in the manner of his choosing,” she added. “He also is going to take those actions in a manner that’s deliberative and that has the objective of deescalating activity in both Syria and Iraq.” The first airstrikes of Biden’s administration were launched on Thursday in eastern …