term:

Speech Or Debate Clause

speech or debate clause n

often cap S&D&C
: a clause in Article I of the U.S. Constitution granting members of Congress a privilege from arrest and legislative immunity for any speech or debate made in either of the houses called also speech and debate clause

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.