Former Trump campaign manager Paul Manafort is directly challenging Special Counsel Robert Mueller, charging in a law suit filed on Wednesday that the prosecutor lacked the legal authority to investigate and indict him on pre-2016 money laundering charges. Calling the indictment “fanciful,” attorney Kevin Downing’s suit in U.S. District Court says Mr. Mueller was appointed in May with a mandate to investigate possible Russia-Trump campaign collusion in the hacking of Democrat Party computers.