He's down, but he's not out. Well, not yet. Isolated at home in Delaware, where he's recovering from COVID, Joe Biden has a decision to make. President Obama's reported concern has opened the floodgates, the number of Democrats calling for a new candidate growing.

He's pretty insulated by his inner circle and by two family members, in particular, his wife and his sister, and his son, Hunter Biden, who's also very much engaged in the White House meetings. But it's really hard. How do you walk away from five decades of public service? How do you walk away from the presidency? So right now, I think we should give him the space to make the right decision, because I think he will. He understands what's at stake In stark contrast to the divisions among Democrats, Republicans have rarely seemed more united.

Donald Trump rising in the polls, is based deeply moved by his account of surviving the attempted assassination.

There was blood pouring everywhere, and yet in a certain way, I felt very safe because I had God on my side. I felt that.

Here on Capitol Hill, people aren't sure what to think. The President says he's looking forward to returning to the campaign next week, but sources close to the Biden family say they're already discussing his exit strategy. If this is the end of the road, it'll be much much simpler for the Democrats if Joe Biden makes that decision himself. David Blevins, Sky News in Washington.