The independent Idaho gubernatorial candidate released a video message himself voicing support for the protests.
Bundy is running as an Independent in Idaho's gubernatorial race.
The confrontational anti-government activist made a full break with the party that had already been uneasy with his presence.
Ammon Bundy was ordered to pay more than $1,000 in fines and complete 40 hours of public service for trespassing and officer obstruction convictions.
The report said the organization has grown by 53 percent in the last year, having a total of more than 33,000 members across the country and even in Canada.
The Idaho gubernatorial candidate slammed Donald Trump for stereotyping all immigrants as "criminals."
"I'm tired of our freedoms being taken from us and I'm tired of the corruption that is rampant in our state government," the anti-government activist says in his campaign video.
The state's lieutenant governor has links to far-right militia members. The increase in state militia presence could lead to a rise in extremist violence, one expert says.
"We do not support his antics or his chaotic political theater," Idaho Republican Party Chairman Tom Luna said in a statement on Friday.
Bundy was arrested twice in two hours during his last visit to the Idaho statehouse in April this year.
"When I was standing there...I honestly could imagine, accurately I believe, what a Jewish person felt in the '30s in Germany," Bundy said of being asked to wear a mask.
The militia leader was protesting a COVID-19 related civil liabilities bill that would allow groups to be sued if they disregard government health mandates.
A report for the Washington state legislature concluded Matt Shea promoted violence.
The Justice Department is considering legal changes to combat domestic anti-government extremists.
Finicum's relatives say he wasn't armed at the time of his death.
The video shows Finicum exiting a vehicle with his hands raised, before he reaches in his jacket for something.
A few holdouts remain despite pleas from their jailed leader, Ammon Bundy, to stand down.
His statement came a day after his arrest and the death of his supporter, LaVoy Finicum.
Militia leaders Ammon and Ryan Bundy were arrested on Tuesday night.
Despite Bundy's arrest, protesters are still occupying the remote Malheur National Wildlife Refuge in eastern Oregon.
The Malheur militants seem more interested in winning over the media than firing on the Feds.
The latest call to arms appears to have failed to resonate with like-minded groups.
Property rights advocates need to find ranchers more appealing than the Bundys or the Hammonds.
The occupation of the Malheur National Wildlife Refuge is the latest showdown between federal law enforcement officers and gun-toting militants.