Independent journalist and O'Keefe Media Group founder James O'Keefe was served a restraining order while he was filming a live show this week.

Footage shows a sheriff's deputy walking into O'Keefe's studio and presenting him a restraining order filed by former Project Veritas board member Matthew Tyrmand, accusing him of domestic violence.

"This is insane. There's a sheriff in my studio serving me domestic violence documents because the board member said he wanted to murder me," O'Keefe said.

"And I know you're just doing your job and I get it," O'Keefe told the officer, adding, "I understand, but we're entering a constitutional crisis in the United States. And today I've got a police officer bringing me to court."

Tyrmand was the subject of an OMG sting op last month where O'Keefe confronted him inside a restaurant asking why he'd made death threats towards him.