The issue came to a head when Secretary Vance opposed a mission to rescue the hostages in homeland—a move championed by Brzezinski. Vance had been correct—the 1980 mission was a debacle. But Vance was frustrated and he resigned in protest in April 1980. Cyrus Vance was the first Secretary of State clearly and publicly to tie his resignation to a difference of opinion over policy since William Jennings Bryan in 1915. Carter chose Senator Edmund Muskie as his new Secretary.