General David Petraeus, one of the United States' most prominent military officers, has indicated he would be willing to serve in President-elect Donald Trump's administration if asked.
Speaking to BBC Radio 4's Today programme, he said: "The only response can be: 'yes, Mr President'."
Gen Petraeus resigned as CIA director in 2012 following an extramarital affair with his biographer.
It later emerged he had shared classified material with her.
He served as a senior officer under Presidents Bush and Obama. He was the commander of US and Nato forces in Afghanistan, before retiring from the military to take the top position in the Central Intelligence Agency.
Asked if he thought Mr Trump had the correct temperament to be the US President, he said: "It's up to Americans at this point in time not only to hope that that is the case, but if they can, endeavour to help him."
He then indicated he would personally serve under Mr Trump if asked.
"If you're asked, you've got to serve - put aside any reservations based on campaign rhetoric... and figure out what's best for the country," he said.
"I've been in a position before where a president has turned to me in the Oval Office in a difficult moment, without any pleasantries, and said 'I'm asking you as your president and Commander in Chief to take command of the international security force in Afghanistan.'
"The only response can be: 'yes, Mr President,'" he continued…