FILE PHOTO: White House Acting Chief of Staff Mick Mulvaney watches as U.S. President Donald Trump welcomes the 2018 College Football Playoff National Champion Clemson Tigers in the East Room of the White House in Washington, U.S., January 14, 2019. REUTERS/Joshua RobertsWASHINGTON (Reuters) - Democratic lawmakers seeking President Donald Trump’s tax returns will never get…