Rex Features
The rapper explained that he knows the president listens to his album when he is exercising.
Speaking to Jonathan Ross, he said: "Barack loves hip-hop. When I called him, he was playing Blueprint in the gym.
"I've been invited to the White House a couple of times. Hopefully we'll keep him in for eight years so I'll have time to get there."
> Obamas 'reveal iPod, movie choices'
