Joe Biden was caught making another public blunder when he read out a prompt to “pause” from a teleprompter. The President, 81, had been speaking at a trade union event in Washington when he struggled with reading from the autocue.

This marks only the latest in a long series of gaffes the president has made while speaking in public, with his track record of blunders increasingly used by Mr Trump and his supporters to claim that the 81-year-old is too old to serve another term in the White House and is in a state of “cognitive decline”.