William Todd Wilson was the first Oath Keeper to breach the Capitol building, prosecutors claim.
Charles Donohoe said he was aware that Proud Boys leaders were considering “storming” the Capitol at least two days before the attack.
Joshua James is the sixth member of the militant group to strike a deal with prosecutors.
Stewart Rhodes, who was charged with seditious conspiracy last month, had challenged a prior ruling to keep him detained, claiming he was not a flight risk or a danger.
Oath Keepers Founder Stewart Rhodes Has Been Ordered To Stay In Jail Until Trial For Seditious Conspiracy
The extremist group leader has shown a “propensity towards violence,” a federal magistrate said in making the decision.
The theory is based on texts citing the overthrow of Serbia’s government in 2000.