Obama expected to nominate Ashton Carter to lead Pentagon: sources

By Phil Stewart and Steve Holland WASHINGTON (Reuters) - Former Pentagon official Ashton Carter emerged on Tuesday as the expected nominee to replace Chuck Hagel as U.S. defense secretary, sources familiar with the situation said. Carter, a former deputy secretary at the Department of Defense, would have the task of breaking into the tight-knit White House inner circle that President Barack Obama has leaned on to run national security policy. ...