Donald Trump ordered Robert Mueller fired June, 2017, citing pitiful “conflicts of interest” as his justification. White House counsel Don McGahn saw through it and refused. New York Times:
First, he claimed that a dispute years ago over fees at Trump National Golf Club in Sterling, Va., had prompted Mr. Mueller, the F.B.I. director at the time, to resign his membership. The president also said Mr. Mueller could not be impartial because he had most recently worked for the law firm that previously represented the president’s son-in-law, Jared Kushner. Finally, the president said, Mr. Mueller had been interviewed to return as the F.B.I. director the day before he was appointed special counsel in May.
After receiving the president’s order to fire Mr. Mueller, the White House counsel, Donald F. McGahn II, refused to ask the Justice Department to dismiss the special counsel, saying he would quit instead, the people said. They spoke on the condition of anonymity because they did not want to be identified discussing a continuing investigation.
Mr. McGahn disagreed with the president’s case and told senior White House officials that firing Mr. Mueller would have a catastrophic effect on Mr. Trump’s presidency. Mr. McGahn also told White House officials that Mr. Trump would not follow through on the dismissal on his own. The president then backed off.
This was all going on at the same time that Mueller’s campaign contributions to Democrats were being scrutinized and Republican Mueller was accused of hiring a team of Democrats to bring down Donald Trump.