Sen. Mike Crapo plans to reintroduce legislation to split up the country’s largest—and long considered most liberal—federal appeals court, the Idaho Republican's office said this month.

For decades, Republicans have endorsed various proposals to split up the U.S. Court of Appeals for the Ninth Circuit, which covers California, Alaska, Hawaii, Arizona, Idaho, Montana, Nevada, Oregon Washington, Guam and the Northern Mariana Islands. The court currently has 29 active and 52 total judges.