@junecasagrande the legitimacy of Supreme Court justices is determined by appointment by a president with consent of elected Senators.
So yes, he is legitimate as he has those things.
I'm sorry you don't like him--I suspect you've been hearing a bunch of misinformation about his term in office--but he remains legitimate.
If your accusations are proven true then he can be impeached. However, these salacious claims have thus far been pretty out there, amounting to conspiracy theories that haven't gained too much of a hold.