In the federal elections of 2005, Westerwelle was his party's front-runner. When neither Chancellor Gerhard Schröder's Social Democrats and Greens nor a coalition of Christian and Free Democrats, favored by Angela Merkel and Westerwelle, managed to gain a majority of seats, Westerwelle rejected overtures by Chancellor Schröder to save his chancellorship by entering his coalition, preferring to become one of the leaders of the disparate opposition of the subsequently formed "Grand Coalition" of Christian and Social Democrats, with Merkel as chancellor. Westerwelle became a vocal critic of the new government. In 2006, according to an internal agreement, Westerwelle succeeded Wolfgang Gerhardt as chairman of the parliamentary group.