One of the things Mueller said Wednesday needs to be repeated: NO ONE is asked their personal political affiliation when hired, promoted, or assigned to non-political jobs within the DOJ!
The GOP has tried to criminalize being a Democrat or at minimum NOT being a Republican inside the DOJ, and this is unprecedented. Historically, everyone knows that LEO tends to heavily skew conservative/Republican since the focus of law enforcement is strict adherence to the LAW - which is not a wildly liberal ethos. It's every individual's right, including FBI investigator's, to be able to participate fully in the democratic electoral process, including donating legally to politicians and campaigns. Inferring professional bias without a shred of actual evidence indicating any, outside of disagreeing with the findings, is never grounds to impugn the character of career officials. Using this line of thought, during jury trials involving Trumpers potential jurors could be asked and then struck if they admit they voted for Hillary. See how ridiculous (illegal) such thinking is in practice if extended to other examples where individuals put their biases aside to undertake important tasks?
All the GOPers are doing is trying to normalize the abhorrent, illicit behavior and inferences of Barr, Nunes, Jordan and their ilk who are trying to say that only loyal GOPers can objectively investigate Republican suspects or even determine what activity is deserving of investigation at all. They want to be the investigators, the grand jury, the judge and if needed, the jury. You don't get justice from such a construct, you get authoritarianism under the color of what looks like a just process.
It's not, it's a rubber stamp for doing whatever they deem needs to be done towards the ends they desire. Nothing is more anti-American.