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On Thursday, the FBI arrested a political appointee of President Trump on charges connected to the violent riots at the U.S. Capitol, marking the first arrest of a Trump Administration official involved in the insurrection.

Federico Guillermo Klein, 42, was taken into custody by authorities and faces multiple felony charges related to the riot, including knowingly engaging in an act of violence against any person or property in a restricted building or grounds. The former low-level State Department official and Trump campaign employee served under the President from 2017 until his resignation in January.

Klein held a top-secret security clearance that was renewed in 2019, according to the FBI. He was still employed by the State Department as a staff assistant on January 6th when he joined the mob to storm the U.S. Capitol.

According to court documents, Klein was physically and verbally involved with police officers in the tunnel leading to the Capitol grounds. The complaint against the Trump appointee claims he used a stolen police shield to batter officers and pry open a door to call for reinforcement who planned to confront members of congress in an attempt to overthrow the government.

Klein’s arrest is the most-direct link between the Trump Administration and the insurrection crowd. Many of the 300+ people arrested by federal agencies are self-described Trump supporters including members of the Proud Boys and Oath Keepers.

After the violence, Klein returned to work at the State Department until his final day of Jan. 19 before Biden’s inauguration. He is scheduled to appear in court on Friday afternoon.