Pentagon ex-head Gates criticises Obama
8 January 2014 Last updated at 15:56 GMT
Former US Secretary of Defense Robert Gates has written a book strongly criticising President Barack Obama's handling of the war in Afghanistan.
In Duty: Memoirs of a Secretary of War, Mr Gates says that the president was sceptical that his administration's Afghan strategy would succeed.
"I never doubted [his] support for the troops, only his support for their mission," Mr Gates writes.
Mr Gates was Pentagon chief under Presidents Obama and George W Bush.
Nick Childs reports.