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A New Jersey gym owner pleaded guilty on Friday to assaulting a in the by supporters of then-president .

Scott Fairlamb, who is 44 years old and the brother of a agent, now faces up to just more than four years in prison for joining the attack, which sought to prevent Congress from certifying President Joe Biden's defeat of Trump in the November 2020 election.

In a hearing in Washington federal court on Friday, the former mixed martial arts fighter was the first out of hundreds charged in the attack to plead guilty to assaulting a police officer.

Videos taken of the melee showed him shouting and blocking a police officer as he waved a collapsible baton. Fairlamb shouted to "patriots" to disarm the police and storm the building.

He also pleaded guilty to obstructing an official proceeding by Congress.

Several other charges were dropped.

While Fairlamb could get up to 20 years in prison, official guidelines set for his crimes and lack of a major criminal history puts the recommended jail time at between 41 and 51 months.

But a judge could give him less or more jail time when the sentence is handed down on 27 September.

A second man, Devlyn Thompson of Washington state, also pleaded guilty on Friday to assaulting police on 6 January.

Thompson, 28, was among a group that threw objects at police and took their riot shields.

He was also seen swinging a metal baton at officers.

A congressman sues former president Donald Trump, accusing him of violating the 19th century 'Ku Klux Klan Act' by supporting the attack on the US Capitol

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Thompson also faces a maximum 20-year sentence, though it is likely to be closer to the range suggested in the Fairlamb case.

The Justice Department said on Friday that more than 570 people had been arrested and charged in relation to the 6ÌýJanuary attack, with only a handful having reached the plea and sentencing stage of the process.

Most have been hit with minor charges of illegally entering the Capitol, but more than 170 face severe felony charges, including assault and conspiracy.