The new secretary of defense, Ashton Carter, said Saturday the U.S. may slow down the withdrawal of American troops from Afghanistan. Carter made the announcement during his first trip to Afghanistan as defense secretary. On the flight there, Carter also discussed an impending battle against the Islamic State of Iraq and Syria, or ISIS, in Iraq - the battle for Mosul. A senior Obama administration official told CBS News that neither Carter nor the White House knew about that briefing, where a military official also said the assault would include between 20,000 and 25,000 Iraqi troops backed by U.S. air...