 OK, thank you very much for your thoughts, Mehran Kamrava in Qatar. Now, since his disastrous debate performance 10 days ago, Joe Biden has been facing questions about whether he should step down from the presidential race. A handful of Democratic donors and congressmen want him to stand aside and allow another candidate to take on Donald Trump in November. But at a rally in the state of Wisconsin on Friday, he told supporters he was determined to fight on.