The largest militia group in the US will refuse to recognise President-elect Joe Biden as the nation’s duly elected leader when he is sworn in on 20 January 2021.

The Oath Keepers, an armed right-wing organisation that boasts tens of thousands of members with law enforcement and military backgrounds, was one of several groups to demonstrate in Washington over the weekend at the “Million MAGA March” in support of Donald Trump, whom news networks project has lost the 2020 election.

“I think about half this country won’t recognise Biden as legitimate. They won’t recognise this election,” Stewart Rhodes, who founded the Oath Keepers, told The Independent on Saturday in the nation’s capital.

“What that means is that everything that comes out of his mouth will be considered not of any force or effect, anything he signs into law we won’t recognise as legitimate. We’ll be very much like the founding fathers. We’ll end up nullifying and resisting,” Mr Rhodes said.