A Pennsylvania man was indicted for allegedly threatening President Biden, a member of Congress and a federal judge, officials said.

Robert Maverick Vargo, 25, of Berwick, was indicted by a federal grand jury on Wednesday for allegedly mailing a letter to U.S. Rep. Bennie Thompson’s office containing threatening language, according to the Department of Justice.

Vargo is formally charged with threatening the president, sending interstate communications with a threat and influencing a federal official by threat.

Chairman Bennie Thompson, D-Miss., and Rep. Liz Cheney, R-Wyo., take their seats for the Select Committee to Investigate the January 6th Attack on the Capitol hearing on Thursday, October 13, 2022.  (Bill Clark/CQ-Roll Call, Inc via Getty Images)

The letter included threats to kill Biden, Thompson and his family, and U.S. District Court Judge Robert D. Mariani. Thompson is the chairman of the House Select Committee investigating the U.S. Capitol Riot on Jan. 6.

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The letter also alluded to "Anthrax" and contained what appeared to be a white powder.

"I’m going to kill you! I will make you feel the rest of our pain & suffering," prosecutors said Vargo wrote in the letter. "There is nowhere or nobody who can keep you from me."

U.S. Capitol police officers gather on the east front plaza of the Capitol on February 28, 2022, in Washington, DC.  (Justin Sullivan/Getty Images)

The letter continued: "I am going to kill you & those you love. I promise you that I will keep my promise until the day of my death. You & Joe Biden soon will face death for the wrongs you’ve done to US."

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The letter was received by congressional staff inside the Rayburn House Office Building on Oct. 11. It prompted a shelter-in-place call for offices near Thompson's, although an all-clear was given later that same day.

President Biden speaks in the Eisenhower Executive Office Building in Washington, DC, US, on Wednesday, Oct. 19, 2022.  (Al Drago via Getty Images)

Members of the U.S. Capitol Police Hazardous Material Response Team ultimately determined the white powder did not pose a threat.

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Investigators alleged the threatening letter was sent by Vargo from the Luzerne County Correctional Facility in Wilkes-Barre, PA.

U.S. Capitol Police, Protective Service Bureau and the U.S. Secret Service are still investigating the incident.

A video of former President Donald Trump displayed on a screen during a hearing of the Select Committee to Investigate the January 6th Attack on the US Capitol in Washington, DC, US, on Thursday, Oct. 13, 2022.  (Alex Wong/Getty Images via Getty Images)

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Vargo faces a total maximum penalty of 25 years in prison, supervised release and a fine.