It was a disastrous image for an 80-year-old president who has just announced his campaign for a second term.

Collapsed on the ground, unable to get up, sensible rubber soles on full display as Secret Service agents try to hoist him to his feet.

It’s not even shocking at this stage. It’s just sad. Sad for the country.

It adds to the perception of an enfeebled America, vulnerable to the predations of its enemies. Joe Biden falling of a bike. Joe Biden tripping up the stairs of Air Force One. Joe Biden getting lost on stage. Joe Biden losing his train of thought: “Well, anyway”.