FRESNO, Calif. (AP) — Pete McCloskey — a pro-environment, anti-war California Republican who co-wrote the Endangered Species Act and co-founded Earth Day — has died. He was 96.

A fourth-generation Republican “in the mold of Teddy Roosevelt,” he often said, McCloskey represented the 12th Congressional District for 15 years, running for president against an incumbent Richard Nixon in 1972. He battled party leaders while serving seven terms in Congress and went on to publicly disavow the GOP in his later years.

He died at home Wednesday, according to Lee Houskeeper, a family friend.

Years after leaving Washington, McCloskey made one last bid for elective office in 2006 when he challenged Richard Pombo of Northern California’s 11th District in a primary race that McCloskey described as “a battle for the soul of the Republican Party.” After losing to Pombo, who had spent most of his tenure in Washington attempting to undo the Endangered Species Act, he threw his support behind Democrat Jerry McNerney, the eventual winner.