Getty Images

Federico Klein, a former State Department aide who worked on former President Donald Trump's 2016 campaign, was arrested Thursday on charges related to the Jan. 6 Capitol riot, the FBI announced Thursday night.

This is the first known instance of a Trump appointee facing prosecution in connection with the attack, Politico reports. An FBI Washington Field Office spokeswoman told Politico that Klein, 42, was taken into custody in Virginia, but did not release any information on the charges against him.

Federal Election Commission records show Klein worked as a tech analyst for the 2016 Trump campaign, Politico says, and after the election he was hired at the State Department. A federal directory from last summer lists Klein as a special assistant in the Bureau of Western Hemisphere Affairs, making him a "Schedule C" political appointee, Politico reports.

On Jan. 6, a pro-Trump mob stormed the Capitol in an attempt to stop Congress from certifying President Biden's victory. Klein's mother, Cecilia, told Politico on Thursday night that he told her he was in Washington, D.C., on the day of the riot, and "as far as I know, he was on the Mall." She is a retired economist and trade official, and told Politico because of their different views, she rarely spoke about Trump or politics with her son. "Fred's politics burn a little hot," she said. "But I've never known him to violate the law."