Presumptive GOP presidential nominee Mitt Romney was forced to backpedal a little after implying that London might not be capable of pulling off a successful Olympic games, just hours before he was supposed to pay a visit to Downing Street.

The statement left the Brits "speechless," a senior government official told The Guardian. British Prime Minister David Cameron quickly fired back. "We are holding an Olympic Games in one of the busiest, most active, bustling cities anywhere in the world," he said. "Of course it's easier if you hold an Olympic Games in the middle of nowhere." (Presumably "middle of nowhere" was in reference to Salt Lake City, where Romney organized the 2002 games.)

After a 45-minute meeting at Downing Street, Romney stated he had seen "imagination and forethought and a lot of organization" in London, and he expects the Games to be "highly successful."

But singer John Legend couldn't resist turning the situation back to an earlier stumble this week.

"I think Mitt was so used to criticizing the incumbent, he forgot he's not running against Cameron," Legend tweeted.

"So much for his deep understanding of Anglo-Saxon-ness."