MONTEBELLO, Quebec – Leaders of the United States, Canada and Mexico have begun their discussions of the Security and Prosperity Partnership behind closed doors here at the five-star Fairmont Le Chateau resort in Montebello, Quebec. President Bush arrived at mid-afternoon yesterday, with the presidential helicopter landing on the club's golf course, as Canadian Prime Minister Stephen Harper was waiting to greet him. As the two met, Harper commented that Bush appeared to travel with his own security army of Secret Service. Mexico's President Felipe Calderon arrived later, and could be the first to depart as forecasters estimated Hurricane Dean is...