Democratic Sens. Dick Durbin of Illinois, Kirsten Gillibrand of New York, Richard Blumenthal of Connecticut and Mazie Hirono of Hawaii joined the Whitehouse brief.

Judicial Watch, a conservative oversight group, filed an ethics complaint against Whitehouse with the Rhode Island Supreme Court in August. Senate Republicans sent a letter to the Supreme Court accusing Whitehouse and certain Democratic presidential candidates of threatening the justices with “political retribution.” The GOP lawmakers added that the number of justices will remain fixed at nine for as long as they serve.

The case is No. 18-280, New York State Rifle and Pistol Association v. City of New York.

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Image: Reuters.