Will Biden drop out? Key questions on his presidential campaign

With just one month left before the Democrats convene for their convention, the party has limited time to determine who will be on the top of the ticket

As he addressed reporters at the conclusion of the Nato conference on Thursday, Joe Biden sent a defiant message to his critics: I'm not going anywhere. Despite demands from dozens of Democratic lawmakers that he withdraw from the presidential race following his disastrous debate performance, Biden argued he was the best candidate to defeat Donald Trump in November.

I think I'm the most qualified person to run for president. I beat him once, and I will beat him again," Biden said. There's a long way to go in this campaign, and so I - I'm just going to keep moving."