Barack ObamaBarack Hussein ObamaSenator Tom Coburn's government oversight legacy Biden could be picking the next president: VP choice more important than ever Civil rights leader Joseph Lowery dies at 98 MORE is warning supporters that the general election fight between him and John McCainJohn Sidney McCainJuan Williams: Biden's promises on women are a big deal Ernst calls for public presidential campaign funds to go to masks, protective equipment President Trump is right — Now's the time for 'all hands on deck' MORE may get ugly, but the Illinois senator is vowing not to back down.

"If they bring a knife to the fight, we bring a gun," Obama said at a fundraiser in Philadelphia Friday, according to pool reports.

"We don't have a choice but to win," Obama said, joking that he has heard "folks in Philly like a good brawl. I've seen Eagles games."

ADVERTISEMENT
Obama again said that the GOP will make try to make him look "scary" to voters.

Obama pledging to swing back at the GOP drew much applause from the crowd.

Republican National Committee spokesman Alex Conant said Obama's rhetoric abandons Obama's campaign themes of hope and change.

"In the last 24 hours, he