File photo of U.S. Secretary of the Interior Ken Salazar in Charlotte

 
File photo of U.S. Secretary of the Interior Ken Salazar in Charlotte
U.S. Secretary of the Interior Ken Salazar addresses delegates during the first day of the Democratic National Convention in Charlotte, North Carolina, in this September 4, 2012 file photo. Salazar is expected to announce he is stepping down, a White House official confirmed on Wednesday. REUTERS/Eric Thayer/Files