Covering the White House and U.S. politics for Reuters
AF1 just landed in Tallinn Estonia in first leg of trip that will end at NATO summit in Wales
NSC on purported Sotloff video: "If genuine, we are appalled by the brutal murder of an innocent American journalist..."
Obama, in Milwaukee, says he has made economic progress despite entrenched opposition: "Every gray hair was worth it."
Among the greeters for Obama on landing in Milwaukee: Gov Scott Walker
Inbox: VP Biden will travel to Portsmouth, New Hampshire, on Weds for an economy event with members of Congress.