Barack ObamaBarack Hussein ObamaTrump's intervention on military justice system was lawful and proper The mullahs seek to control uncontrolled chaos Poll: Majority of Democrats thinks Obama was better president than Washington MORE is warning supporters that the general election fight between him and John McCainJohn Sidney McCainBudowsky: Would John McCain back impeachment? Sharice Davids to vote for Trump impeachment articles: 'The facts are uncontested' Ex-Rep. Scott Taylor to seek old Virginia seat 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."

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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