Literally not true. Mueller didn't qualify on 2 fronts:
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Aged out. He was 72 at the time of the OO meeting.
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Already served a previous 10 year term, +2 years.
Mueller simply did NOT qualify for the position, and the President cannot go against congressional law to do "whatever the fuck he wants". Mueller met POTUS under the guise of becoming FBI director. The person was already chosen before Mueller went into the OO to meet with POTUS. Chris Wray.