Marco Rubio Calls on Attorney General Holder to Resignbr The Christian Science Monitor - St. Regis Hotelbr On Thursday, June 21, 2012, Florida Senator Marco Rubio joined the Monitor Breakfast for a conversation with reporters. Marco Antonio Rubio is the junior United States Senator from Florida (2011 to present). A member of the Republican Party, he previously served as Speaker of the Florida House of Representatives (2007-2009). He is the author of the book, An American Son: A Memoir.