This guy's not gonna last

Gates calls for Guantanamo closure

WASHINGTON (AP) -- The U.S. Congress and the administration of President George W. Bush should work together to allow the U.S. to permanently imprison some of the more dangerous Guantanamo Bay detainees elsewhere so the facility can be closed, Defense Secretary Robert Gates said Thursday.

What does it mean when the US Secretary of Defense has to "call" for this to happen? Just how much daylight is there between him and his boss? (link goes to AP story on CNN)