22 N.Y.C.R.R. § 500.9

         N.Y. Court of Appeals Rules of Practice
22 N.Y.C.R.R. § 500.9.  Preliminary Appeal Statement.
(a)  Within 10 days after an appeal is taken by (1) filing a notice of appeal in the place and manner required by CPLR 5515, (2) entry of an order granting a motion for leave to appeal in a civil case, or (3) issuance of a certificate granting leave to appeal in a noncapital criminal case, appellant shall file with the clerk of the Court an original and one copy of a preliminary appeal statement on the form prescribed by the Court, with the required attachments and proof of service of one copy on each other party. No fee is required at the time of filing the preliminary appeal statement.
(b)  Where a party asserts that a statute is unconstitutional, appellant shall give written notice to the Attorney General before filing the preliminary appeal statement, and a copy of the notification shall be attached to the preliminary appeal statement. The notification and a copy of the preliminary appeal statement shall be sent to the Solicitor General, Department of Law, The Capitol, Albany, New York 12224.
(c)  After review of the Preliminary Appeal Statement, the clerk will notify the parties either that review pursuant to section 500.10 or section 500.11 of this Part shall commence or that the appeal shall proceed in the normal course.
42 U.S.C. § 2403.  Intervention by United States or a State; constitutional question

(a)  [Omitted ― Governing notice to the United States]

(b) In any action, suit, or proceeding in a court of the United States to which a State or any agency, officer, or employee thereof is not a party, wherein the constitutionality of any statute of that State affecting the public interest is drawn in question, the court shall certify such fact to the attorney general of the State, and shall permit the State to intervene for presentation of evidence, if evidence is otherwise admissible in the case, and for argument on the question of constitutionality. The State shall, subject to the applicable provisions of law, have all the rights of a party and be subject to all liabilities of a party as to court costs to the extent necessary for a proper presentation of the facts and law relating to the question of constitutionality.