§ 5. He or she shall represent the Senate, or engage legal representation on behalf of the Senate, in any legal action or proceeding involving the interpretation or effect of any law of the federal, state or local government or the constitutionality thereof or with regard to the enforcement or defense of any right, privilege or prerogative of the Senate.
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N.Y. Senate Rules § R3S5, under The Temporary President.
N.Y. Senate Rules § R3S5