It still blows my mind that our Congress members can lie, tell any lie in Congress and not be held accountable.
It comes from the Constitution.
Members of Congress have immunity from the law for anything they say while Congress is in session, or traveling to or from Congress.
It was meant to protect the independence of members of Congress from domination by the Executive branch, and to protect minorities in Congress from domination by the majority.
This had happened frequently in England.