Those quotes prove my point. Trump did not say he can't do his job because of his heritage. He said he isn't doing his job, and that he thinks it's because of his heritage.

And there's nothing racist about that conclusion. People do act based on their identity and heritage, and there's nothing wrong with that. If it affects their rulings as a judge, then that's problem, and all Trump has said is that he's not getting fair rulings (subjective, but that is his POV), and that there's an obvious potential conflict of interest.