I’m no lawyer, but I don’t think you can impeach Congressmen and Senators. They can be Censored, but impeachment is for Pres and VP. They can be prosecuted if they allow it themselves. A Congresscritter cannot even be arrested while in session. If Boehner or Pelosi doesn’t allow it, what then?
1787-1800
February 5, 1798
To Arrest an Impeached Senator
http://www.senate.gov/artandhistory/history/minute/To_Arrest_An_Impeached_Senator.htm