Questions stirred anew this week on the legality of waterboarding, a controversial interrogation tactic, after new Congressional hearings examining its use on terrorist suspects. After a recap of the hearings, analysts Mark Shields and David Brook weigh the debate.

Canada will pull its 2,500 troops out of Afghanistan in early 2009 unless NATO adds soldiers in the dangerous southern region, Prime Minister Stephen Harper said Monday, signaling Ottawa has lost patience with what it sees as allies' foot-dragging.