Following the 11 September 2001 attacks in the United States and the launch of the U.S.-led War on Terror, the Liberal Democrat MPs backed the government's decision to participate in the United States invasion of Afghanistan. The party was more critical of Blair's decision to participate in the U.S.-led invasion of Iraq in 2003; Kennedy joined the large anti-war march in London. With the Conservatives backing the Labour government's decision to go to war, the Lib Dems were the only major party opposing it. In following years, Lib Dem MPs increasingly voted against the Labour government on a range of issues. Much of this Lib Dem opposition to the government came from their members in the House of Lords. In the 2003 local elections, the party secured about 30% of the vote, its highest ever result.