The Speech or Debate Clause is a clause in the United States Constitution (Article I, Section 6, Clause 1). The clause states that "The Senators and Representatives" of Congress "shall in all Cases, except Treason, Felony, and Breach of the Peace, be privileged from Arrest during their attendance at the Session of their Respective Houses, and in going to and from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place."
The intended purpose is to prevent a U.S. President or other officials of the executive branch from having members arrested on a pretext to prevent them from voting a certain way or otherwise taking actions with which the president might disagree. It also protects members from civil suits related to their official duties.[1]
A similar clause in many state constitutions protects members of state legislatures. Legislators elsewhere in the world are often similarly protected under the doctrine of parliamentary immunity.
to protect the integrity of the legislative process by insuring the independence of individual legislators