You are attacking a man in Mueller who's served his country with honor and distinction for most of his adult life based on nothing, from your link ....
"This week — amid allegations that President Trump pressured Comey to drop a probe into former national security adviser Michael Flynn — the ousted FBI director’s associates have praised his truthfulness and credibility.
It’s a quality that many Republicans and Democrats believe Comey shares with Mueller, his predecessor.
“Regardless of your chosen career, you are only as good as your word,” Mueller told William & Mary’s graduating class in 2013. “You can be smart, aggressive, articulate, and indeed persuasive. But if you are not honest, your reputation will suffer. And once lost, a good reputation can never, ever be regained.”
The link you posted highlights a close working relationship and nothing more, I have no doubt they respect eachother but to suggest Mueller would breach ethical boundaries because of that is a baseless accusation and nothing more than partisan politics .
Compared to Robert Mueller you are pond scum .
If you actually to learn what kind of men Mueller and Comey are read this article
https://www.google.ca/amp/www.latim...domestic-surveillance-20170517-story,amp.html
"As they crossed the threshold into the White House, both men fully expected it to be the last time they would enter the building, the last time they would brief the president, the last time their motorcade would pass through the White House gate without a pause, zipping past the Jersey barriers and gawking tourists straining to see through the tinted windows. Sitting in their desks at the Justice Department and the Bureau were letters of resignation, which they expected to submit over the weekend; a dozen other Justice and Bureau officials would join them. They would have submitted the letters already, except that the attorney general’s chief of staff had asked them to wait until the hospitalized John Ashcroft had recuperated enough to resign as well."