Quote from canyonman00:
As usual they are above the law. They would likely hide underneath:
Speech Or Debate Clause, Art. I, sec. 6, cl. 1
...of the constitution. Rules don't apply to us all you know. I am waiting any day now to hear the proposal for the new, "Immigrant Bill Of Rights." This should clear up all the issues for legal Americans as to our duties and responsibilities to foreign applicants. 
Your interpretation is incorrect as a matter of law. The laws concerning civil immunity from litigation of Federal government officials and employees are pretty much case by case; they are legally reasonable, but they are not necessarily fair or obvious.
Members of Congress are only protected from suit for statements which injure another person, if the statements are made while the Congressperson is actually speaking on the floor of the House or Senate. If a Congressperson walks outside onto the steps of the Capitol Building, and states the same things, and those statements are civilly actionable, then the Congressperson is amenable to suit.
Likewise, a Congressperson can be charged with any crime during a session of Congress, but he/she cannot be arrested until the session is over, except for a felony or for breach of peace misdemeanor.
And, a Congressperson can be sued civilly just like any other person for anything that he/she does while in office, whether or not within the scope of official duties/authority.
Only the President, VP, and members of their close staff are totally immune from civil action, and only the President and VP are immune from criminal prosecution until removal by impeachment.
Judges, Federal Prosecutors and their staff, have civil immunity while acting within the scope of authority, as do appointed Agency and Department heads has (such as Secretary of State, Treasury, SEC head, etc.).
All other lower level federal employees have immunity from civil suit for policy related activities, but not for ministerial acts. This means, for example, that you can sue the government for injuries caused by its negligent management of an ammo dump, if there's an explosion that destroys your home, but not for the policy decision to locate ammunition near your home.
