Well, admitting it isn't impeachable. Doing it in the first place, sure. In some areas, including Presidential impeachment, the interparty tension dominates over the inter-branch tension intended, so things don't work right; Senators are more concerned with blocking the other party from power than blocking the Oval Office from gaining power. That makes it a waste of time in the current climate. Rest assured neither the pro-president nor anti-president sides (now or with Clinton) are doing it for the Constitution's sake; it's all partisan. It might be about protecting the Constitution, if it worked. (Though it would probably merely indicate that Party A controls the presidency, Party B strongly holds the Senate, and Party B wants the VP in for some reason.) Since it doesn't work, it is in fact a waste of time. Although my tendency is to call anything that makes the Senate waste time a good thing.