Well, you arguably can impeach a member of Congress.
But it’s never happened, because both Houses have rules that allow for the expulsion of members, and it is a much easier standard to reach than impeachment as described in the Constitution.
The legal question is whether members of Congress are “civil Officers of the United States”. The Court has never ruled on this, but I would argue that they are.
Is the hashtag what it is your talking about? Personally…I’d say he used that word because it’s the word of the moment. It’s the hottest word in Libville and on almost every news channel and news source running. He’s attempting to transfer some of this energy to his POV IMHO.
It is long settled precedent that Representatives and Senators are NOT subject to the impeachment process. They are subject only to the much simpler process of expulsion.
The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.
Civil Officers do NOT include Representatives or Senators. It does include principle officers and inferior officers. It does not include mere employees. Interestingly, any commissioned military officer could be subject to impeachment. Enlisted personnel could not be subject to impeachment. Career civil servants, whether on the General Schedule or in the Senior Executive Service would not be subject to impeachment.