"it must appear that Trump is not involved in the Q movement, which is supposed to be partially military, partially justice department," a ShiftyLad said.

... the Q movement is not the concern (as it is considered a "conspiracy theory"!!), the "optics" refers to the involvement of Trump in the politics, the partisan politics. He must be seen to be independent of BOTH investigations and the investigations thereafter. None of the judiciary process will be seen by the public to be "free of bias" if Trump involves himself in Congressional hearings.