Latest news on U.S.-Iran deal that Trump signed as gas prices drop and nuclear doubts remain: The White House shared a video of President Trump signing the memorandum of understanding with Iran. This comes as questions linger about Tehran's nuclear program and what comes next in negotiations. CBS News' Kathryn Watson reports, and Job Donnison from BBC News, a CBS News partner, has more from Israel. #IranDeal #Trump #GasPrices #NuclearProgram #WhiteHouse