The presidency of George W. Bush began at noon EST on January 20, 2001, when George W. Bush was inaugurated as the 43rd president of the United States, and ended on January 20, 2009. After the terrorist attacks on September 11, 2001, Bush declared a global war on terrorism and, in October 2001, ordered an invasion of Afghanistan to overthrow the Taliban, destroy the terrorist group al-Qaeda, and capture Osama bin Laden. That same month, he signed into law the controversial Patriot Act in order to authorize surveillance of suspected terrorists. By the time Bush took office, reduced economic growth had led to less robust federal budgetary projections, but Bush maintained that tax cuts were necessary to boost economic growth. After Treasury secretary Paul O'Neill expressed concerns over the tax cut's size and the possibility of future deficits, Vice President Cheney took charge of writing the bill, which the administration proposed to Congress in March 2001.