Even for Trump, this quid pro quo is beyond corrupt. As a reward for blocking him from federal prosecution, an inexperienced judge — whose peers have said on record does not understand the law — could be nominated as the US' top lawyer. The leaking of this list undermines justice by incentivizing Cannon to refuse to recuse herself from ongoing cases and instead to rule in Trump's favor.
Cannon took the same oath as every other judge in the US to enforce justice "faithfully and impartially." The idea that she's done anything in the name of a bias toward Trump is baseless criticism from those opposing the Republican. If Trump believes Cannon's qualified to be the next attorney general, he has every right to appoint her if reelected.