European leaders are gathering in Brussels today for a key summit billed as a last-ditch effort to save the eurozone amidst a crippling debt crisis. France and Germany are pushing for treaty changes including tighter controls of European Union members’ sovereign debts. The White House has played a key role in the lead-up to the summit, with Treasury Secretary Timothy Geithner leading a team of U.S. officials in Europe to meet with leaders throughout the week.