2 U.S.C. § 288h : US Code - Section 288H: Defense of certain constitutional powers

Search 2 U.S.C. § 288h : US Code - Section 288H: Defense of certain constitutional powers

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.