Joe Biden regrets having pulled out of this year’s presidential race and believes he would have defeated Donald Trump in last month’s election – despite negative poll indications, White House sources have said.

The US president has reportedly also said he made a mistake in choosing Merrick Garland as attorney general – reflecting that Garland, a former US appeals court judge, was slow to prosecute Donald Trump for his role in the 6 January 2021 insurrection while presiding over a justice department that aggressively prosecuted Biden’s son Hunter.

With just more than three weeks of his single-term presidency remaining, Biden’s reported rueful reflections are revealed in a Washington Post profile that contains the clearest signs yet that he thinks he erred in withdrawing his candidacy in July after a woeful debate performance against his rival for the White House, Trump, the previous month.

The president stepped aside – to be replaced as his party’s nominee by the US vice-president, Kamala Harris – after mounting pressure from fellow Democrats, who cited polling evidence that appeared to show him heading for a near-certain election drubbing from Trump, who was seeking a historic return to the White House as the Republicans’ nominee.