In performing any function under this chapter, the Counsel shall defend vigorously when placed in issue—

(1) the constitutional privilege from arrest or from being questioned in any other place for any speech or debate under section 6 of article I of the Constitution of the United States;

(2) the constitutional power of the Senate to be judge of the elections, returns, and qualifications of its own Members and to punish or expel a Member under section 5 of article I of the Constitution of the United States;

(3) the constitutional power of the Senate to except from publication such parts of its journal as in its judgment may require secrecy;

(4) the constitutional power of the Senate to determine the rules of its proceedings;

(5) the constitutional power of Congress to make all laws as shall be necessary and proper for carrying into execution the constitutional powers of Congress and all other powers vested by the Constitution in the Government of the United States, or in any department or office thereof;

(6) all other constitutional powers and responsibilities of the Senate or of Congress; and

(7) the constitutionality of Acts and joint resolutions of the Congress.