 From March 27 through April 30, 2007, she was the Acting White House Press Secretary while Tony Snow underwent treatment for colon cancer.On August 31, 2007, President George W. Bush announced that Snow would be resigning his post for health reasons and that Perino would become his replacement.Perino served as Assistant to the President and as White House Press Secretary from September 14, 2007, until the end of the Bush administration in January 2009.