President Joe Biden on Monday unveiled ambitious plans to “reform” the U.S. Supreme Court by calling for term limits for justices, a binding ethics code and a constitutional amendment to overturn the court’s recent ruling on presidential immunity.

Biden, who for years had been hostile—or at best noncommittal—to the idea of court reform, has been laying the groundwork in recent weeks for a bold legislative push to rein in what he and many Democrats see as a court that has been captured by conservative activists, is plagued by ethics scandals and whose rulings are out of step with mainstream American political sentiment.