Mitt Romney (Photo: Getty)

Mitt Romney marked the anniversary of Osama Bin Laden's death by appearing at a Downtown firehouse with his newest backer, Rudy Giuliani. The pair was interrupted by a protester who repeatedly shouted, "Mitt Romney, you're a racist!"

Mr. Romney initially countered the high volume interruption with a joke.

"I'm sorry I can't quite hear you," he said with a smile.

His quip didn't stop the protester, who shouted "Mitt Romney, you're a racist!" five more times as he and Mr. Giuliani awkwardly looked on. Eventually, perhaps realizing the screamer wasn't going to stop any time soon, Mr. Romney continued his press conference.

Watch a video of the intense encounter below.