[Ed. – A comprehensive brief, but that’s not really the point, as I’ve maintained all along. Because the Democrats have brought the “whistleblower” into an “impeachment” process, the American people are the ones with the right to know who is accusing the president and what the accuser’s deal is.]
[T]he Sixth Amendment — specifically, the confrontation clause … guarantees the right of cross-examination: In all criminal trials, the accused must be given the right to confront the accusers. Senator Paul has deduced that this must mean that the identity of the so-called whistleblower has to be revealed, lest President Trump be denied his constitutional rights. …
The confrontation clause protects only the accused at a criminal trial. The point is that before one’s liberty is taken away, one must have the opportunity to question one’s accusers. Impeachment, however, is not even a legal proceeding, much less a criminal trial. It is a political proceeding. No one’s liberty is at stake; it is strictly about whether an official should be stripped of political authority — in the president’s case, of the executive power.
Moreover, because the Constitution wholly vests the process of impeachment in the House, and the conduct of impeachment trials in the Senate, those chambers have plenary authority over the respective proceedings. No court has the power to tell the House or Senate what quantum of due process must be afforded to an official in an impeachment case.