Privilege speech is an legal immunity that some legislators will enjoy in the course of their duties. This is also known as parliamentary privilege and given the legislators protection for their actions.

It's called parliamentary privilege

Bob isn't that funny

It is all about the parliamentary privileges of the congressmen which are the privilege from arrest and privilege pf speech and debate.

Mary Patterson Clarke has written:

'Parliamentary privilege in the American colonies' -- subject(s): Politics and government, Legislative bodies, Privileges and immunities, Parliamentary practice