At this point I think that the money is already mostly spent and firing Mueller would just give the LEFT a gift. I cannot believe that there is anything that Mueller can bring against Trump. He may bring something against his son, DJT Jr. but even there it becomes dicey as it involves meeting the Russian Lawyer and what was said afterwards when questioned by the FBI.
Remember, even if Mueller does not find anything legal against Trump, SanFranNan has already said that the Democrats in the House could bring Articles of Impeachment. It is like the District Attorney indicting a ham sandwich before the Grand Jury, can be done but it is just play for the children.

Does anyone here think Whitaker is going to sign off on a request by Mueller to indict anyone remotely associated with Donald Trump?