Billionaire philanthropist George Soros is running full-page ads in major U.S. newspapers challenging the honesty of the Bush administration's case for waging war in Iraq. The ads quote lies from Bush administration officials since before the war and link to a We Deserve the Truth website that urges Americans to lobby for action in Congress.

Hungarian-born Soros, 72, emigrated to the United States from Britain in 1956 and built a fortune as a financier. He is founder of a network of philanthropic organisations active in more than 50 countries that focus on education, public health, human rights and economic reform.