Joe Biden found himself under attack from the right over claims of mental fragility this week after he once again mistakenly referred to his vice president, Kamala Harris, as the president.

The moment occurred on Thursday as the two leaders addressed reporters from the White House about new policies the Biden administration is pursuing at the US-Mexico border, where Ms Harris finds herself criticised by Republicans for not visiting in person as she heads up the White House’s efforts to address surging numbers of migrants.

“President Harris led this effort,” Mr Biden says in a clip that was widely shared by right-leaning accounts, including one affiliated with the Republican National Committee.

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