Joe Biden stopped himself from dropping the f-bomb while discussing President Trump at a roundtable in Philadelphia. The Democratic presidential nominee, 77, was caught on camera almost uttering the profanity Thursday, when the commander-in-chief's record on race came up as a topic of discussion. 'When a president speaks, no matter how good or bad he is, people listen. And when he [Trump] speaks, he gives credibility to these racist f...,' Biden stated, before suddenly catching himself. 'I have to watch my language!' he then added.