Breitbart News has learned exclusively that Clint Eastwood has signed an amicus brief to the Supreme Court, supporting the right of same-sex couples to marry. The brief, which will be released later this evening, has signatures from more than 100 Republican and conservative activists. It involves the case before the Supreme Court, seeking to overturn CA’s Proposition 8, which banned same-sex marriage in the state.

A well-placed GOP source provided Breitbart News with an early glimpse of the brief.