As chairman of the National Republican Senatorial Committee, Cornyn was a strong supporter of Norm Coleman's various court challenges to the 2008 election certification of the Minnesota U.S. Senate race. Cornyn advocated for Coleman to bring the case before the federal court, and said the trial and appeals could take years to complete. Cornyn threatened that Republicans would wage a "World War III" if Senate Democrats had attempted to seat Democratic candidate Al Franken before the appeals were complete. Coleman conceded after the Minnesota Supreme Court unanimously ruled that Franken had won the election.