A spokesperson for the Biden campaign said there was no discussion of Biden stepping aside or not running again. Biden will participate in the second debate with former US President Donald Trump on September 10. US President Joe Biden's disastrous performance in the debate with Republican challenger Donald Trump has prompted a growing number of prominent Democrats to call for him to drop out of the race, but he has said he remains committed to winning the November election. Biden admitted on Friday that his advanced age had created a handicap during the first night of the debate and that he had performed poorly. But he has declared himself up to the task of serving as president for another four years. "I promise you I wouldn't be running again if I didn't believe wholeheartedly that I could do this job, and I intend to take this state in November," Biden told a campaign rally in North Carolina. He also told supporters: "I know I'm not young anymore. I don't walk as easily as I used to. I don't argue as well as I used to, but I know I know what I know - I know how to tell the truth, I know right from wrong, and I know how to do the job well. "