Read the Speech and Debate clause. It says that whatever they say in either House shall not be questioned in any other Place. That is to say; they cannot be p

Read the Speech and Debate clause. It says that whatever they say in either House shall not be questioned in any other Place. That is to say; they cannot be prosecuted for anything they say in either House. The other part (the first part) of the statement merely states that they shall not be arrested while in either House (or going to and from either), unless their arrest is for Treason, Felony and Breach of the Peace.