Don’t you need a crime first before you can impeach? Source of TDS is not an impeachable offense.You seem to be debating an argument I haven't seen anyone make, along with Dershowitz. Has anyone claimed firing Mueller, or even Comey was unconstitutional? If so, I haven't read that perspective.
I'm saying Nixon's constitutional act of firing his AG was used against him in impeachment articles. Is Dershowitz claiming that the firings, and underlying motivation, couldn't legally be used in an obstruction case against Trump?