Marvel UK comics
Optimus Prime met the President at the White House to discuss the state of relations between the United States and the Autobots. Things kind of went down hill after the Insecticons attacked. Optimus believed that the President wouldn't believe that the Autobots weren't behind the attack, and decided not to return to the White House to resume negotiations. Bad news was, the President was willing to give the Autobot leader the benefit of the doubt. When Prime didn't return, the President felt that he was tricked and decided to pursue other options.