Massachusetts Gov. Charlie Baker and state Attorney General Maura Healey are among those urging the U.S. Supreme Court to strike down remaining state bans against gay marriage.

Baker was the only sitting governor among a group of more than 300 prominent Republicans who submitted a brief Friday. Healey, a Democrat and the nation's first gay attorney general, led the filing of a friend-of-the-court brief on behalf of 16 states and the District of Columbia.

The high court will hear arguments on the case April 28.

Noting he has a brother who is gay and married, Baker said he has come to believe there is no moral or legal justification for prohibiting same-sex couples in any state from marrying.

Massachusetts was the first U.S. state to legalize gay marriage.

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