Dubya.

On his recent state visit to Britain George W Bush met the Queen at Buck house.
He turned to the Queen and said "As I'm President I'm thinking of changing the way my country is referred to, I'm thinking maybe it should be a Kingdom."
The Queen replied "I'm very sorry Mr Bush, but in order to be a Kingdom you have to have a King in charge, and you're not a King"
President Bush thought for a while and said "How about a Principality then?" to which the Queen replied "Again to be a Principality you have to be a Prince, and you're not a Prince Mr Bush"
The President thought long and hard before he came up with "How about an Empire then?"
The Queen getting a little annoyed by now replied
"Sorry again Mr Bush, to be an Empire you need to have an Emperor in charge, and you're not an Emperor"
And before Dubya could utter another word, the Queen said "If you ask me, I think your doing quite nicely as a country"