Joe Biden has blamed his poor performance in last week’s presidential debate on jet lag after two overseas trips - despite spending 6 days at Camp David preparing for the showdown.

Speaking at a campaign event in McLean, Virginia, he admitted the debate against Republican rival Donald Trump did not go well.

“I didn’t have my best night, but the fact is that you know, I wasn’t very smart. I decided to travel around the world a couple times, going through around 100 time zones ... before ... the debate. Didn’t listen to my staff and came back and nearly fell asleep on stage. That’s no excuse but it is an explanation”, - said Biden.