State Department says what ambassador tells president is confidential . The White House has said the U.S. will not comment on any specific intelligence matters. Ambassador reportedly warns Obama against sending more troops to Afghanistan . A senior State Department official told CNN that President Obama 's administration has questions about Karzai 's behavior , suggesting it has been inconsistent . Ambassador has expressed concerns about Karzai government in past .
State Department says what ambassador tells president is confidential . The White House has said the U.S. will not comment on any specific intelligence matters. Ambassador reportedly warns Obama against sending more troops to Afghanistan . Ambassador has expressed concerns about Karzai government in past .