Sky News host James Morrow says the United States finds itself in a leadership crisis which is “unprecedented”.

US President Joe Biden struggled with a shaky performance during the first presidential debate with his Republican rival Donald Trump.

“Allow me to offer one gentle point of criticism to the founding fathers: y'all didn't make it easy to suddenly change the president if the chief executive turns out to be dribbling into his corn flakes,” Mr Morrow said.

“That's why we have seen all the breathless speculation about the Democrats making a move to swap Joe out if, of course, he consents to leave.”