Former White House adviser Peter Navarro reported to prison Tuesday for a contempt of Congress conviction, becoming the first senior Trump administration official to be locked up for a crime related to the Jan. 6, 2021, Capitol attack.

Navarro was sentenced to four months in prison for defying a subpoena for documents and a deposition from the House committee that investigated the riot by supporters of then-President Donald Trump.

Navarro was defiant in remarks to reporters before he headed to the federal prison in Miami, calling his conviction the “partisan weaponization of the judicial system.”