Clint Eastwood joined more than 100 Republicans in signing a brief to the Supreme Court arguing that same-sex marriage should be legal, according to NBC News.
An Eastwood rep, as well as a spokesman for the American Foundation for Equal Rights, the group spearheading opposition to California's law banning same-sex marriage, confirmed that the Oscar-winning actor and director signed the brief, which is expected to be filed Thursday in the Proposition 8 case.
Other high-profile people who have filed briefs in the case include Minnesota Vikings' punter Chris Kluwe and Baltimore Ravens' linebacker Bredon Ayanbadejo.
The conservative website Breitbart.com first reported that Eastwood signed the brief.
The nation's high court will hear arguments in the case on March 26. Thursday is the last day for briefs to be filed in the case, and officials told NBC the Justice Department will urge the court to approve gay marriage in California.
The California Supreme Court ruled in 2008 that the state had to allow same-sex marriage. Some 18,000 same-sex couples wed before Prop. 8 was passed, prohibiting gays and lesbians from marrying. Lower courts have ruled the law is unconstitutional.
The Supreme Court will also hear arguments in late March on Section 3 of the Defense of Marriage Act, which bars federal recognition of same-sex marriage.
For Eastwood, it is the first high-profile foray into the national political scene since his controversial appearance at the Republican National Convention, when he sharply criticized President Obama in a routine that had him talking to an empty chair.