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DES MOINES, Iowa (AP) — Authorities say a Sacramento man arrested in Iowa had an assault rifle, ammunition and a “hit list” that named President Joe Biden, former presidents Bill Clinton and Barack Obama, and others.

Kuachua Xiong was pulled over while driving eastbound on Interstate 80 on Dec. 21, the Des Moines Register reported Thursday. Authorities say in a criminal complaint that police stopped Xiong because he was driving aggressively.

Police said Xiong made concerning comments about Biden during the traffic stop, so he was taken to the Cass County Sheriff’s Office for questioning.

He told investigators that he left his home in Sacramento on Dec. 18 to drive straight to the White House to kill people in power, and that if freed, he’d carry out his plan, according to the criminal complaint.

Xiong is charged with one count of making threats to a former president. Authorities say additional charges could be added by a grand jury in a later indictment.

The defendant’s attorneys filed a notice Thursday that he intends to rely on an insanity defense.