State Department says what ambassador tells president is confidential . Obama aides question Obama ambassador 's advice to Obama . Eikenberry previously expressed worry about corruption in Karzai 's government and its ability to partner with the United States to fight the Taliban . Ambassador reportedly warns U.S. against sending more troops to Obama . Ambassador has expressed concerns about Republican government in past .
State Department says what ambassador tells president is confidential . Obama aides question Obama ambassador 's advice to Obama . Ambassador reportedly warns U.S. against sending more troops to Obama . Ambassador has expressed concerns about Republican government in past .