Just let him do his job.
Before he was hired, Bob Mueller was praised by both Parties as the best man to investigate the "Russia scandal".
There is no reason for anyone to gloat, Democrats or Republicans. This man is trying to get to the bottom of the Russians messing with our election process, in an attempt to affect the outcome of the election. It appears that they were successful.
Those that are now yelling for his resignation should be ignored. It's a dirty job but somebody has to do it. I doubt that these folks that are unhappy with Mueller would be happy if a Democrat was appointed to replace him? They are not going to find a better person to get to the truth than Bob Mueller.
There should be no partisan bickering about this investigation. Of course, if you throw a rock into a pack of wolves, the one that gets hit will be the one to howl. That's a natural progression of things.
Everyone, Democrats and Republicans, need to restrain from celebration or vilification. This is about our country, not about a political Party. Let the facts fall where they may. We must have the truth.
Just let Bob Mueller do his job.