WASHINGTON (AP) -- President Barack Obama says the United States, Britain and their NATO allies are committed to shifting to a support role in Afghanistan in 2013.
Obama says that next phase in the transition will be an important step in turning security control over to the Afghans by the end of 2014.
Obama says NATO forces are making "undeniable" progress in Afghanistan. But he says recent "tragic events" are a reminder that the mission is still difficult.
Obama is speaking alongside British Prime Minister David Cameron at joint a news conference the pair is holding in the White House Rose Garden. Cameron is in Washington for an official visit.