Iran said that it will let U.S. government experts help investigate an airplane crash in Tehran. The U.S. is saying nothing in public about the cause of the crash, but officials of several other nations suggest Iran apparently brought down the plane by mistake. The House told the president to consult Congress before taking further military action against Iran. But what will happen to that demand in the Republican-controlled Senate? Also, newly released documents show that some Boeing employees mocked the designers of the 737 Max, as well as regulators who approved the plane.