(CNN) Rob Reiner warned Thursday morning that if President Trump's nominee for the Supreme Court is similar to Justices Neil Gorsuch, Clarence Thomas or Samuel Alito, past rulings will be overturned.

The announcement of Justice Anthony Kennedy's retirement on Wednesday sparked concern for the actor, director and activist, as Kennedy's vote often decided cases on topics like abortion, marriage equality and affirmative action.

"We're going to have rights stripped away" if Trump's nominee is like conservative justices, Reiner told CNN's John Berman. "There's no question about that."

Reiner, known for movies and shows that tackle social issues, outlined his role in the 2015 Supreme Court ruling on Obergefell v. Hodges, which legalized same-sex marriage in the US.

"We were the first group to file a federal lawsuit," Reiner explained to Berman, referring to the 2010 challenge to California's Proposition 8 on equal protection and due process grounds.

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