Mueller had a choice. He could have kept the Grand Jury in northern VA, which is racially and politically diverse to hear and decide the case. The trial juries have the same makeup. Any decision to remove a POTUS, made by this diverse group, would have some legitimacy: a true jury of your peers.
But he chose to move the proceedings to DC. In DC, the Grand Jury and trial jury will reflect the community: all Black and all Democrat. His team, who will decide whom to prosecute, are all Democrat. The judge is a Democrat.
In Trump’s case, his fate will be decided by Democrats. No hint of any cross section of America.
How well will America accept their judgement? Not well from me.
The problem with this scenario is that whatever Mueller finds as "high crimes and misdemeanors" will be so flimsy (firing Comey equals obstruction of justice?) that it will be hard to get enough Congressmen and Senators to commit political suicide to impeach and convict Trump.
Unfortunately when the swamp realizes that they may decide on a more lethal course of action to get rid of Trump.