The 81-year-old US president is very likely to be the last holder of the office who was alive when D-Day took place in 1944. He was 18 months old at the time.

Mr Biden’s age has been a consistent hindrance to his re-election campaign, with more than half of voters reporting that they believe he is too old to run again.

‘Highest honour’

As one veteran sat back down, the president commented: “Good move man,” according to a White House pool report of their interaction.

Mr Biden said it was the “highest honour” to be able to salute veterans in his role as Commander-in-Chief of the US military.

“Freedom is worth it, democracy is worth it,” he added. “Then, now, and forevermore.”

Mr Biden spoke alongside Emmanuel Macron, the French president, who called him “dear Joe Biden” and talked warmly of Franco-American relations.

Twelve presidents have addressed D-Day memorial ceremonies during their time in office, although this year’s 80th anniversary is likely to be the last major milestone that veterans of Operation Overlord will be able to attend.