Prosecutors offered that view in a filing asking a judge to detain Jacob Chansley, the Arizona man and QAnon conspiracy theorist who was famously photographed wearing horns as he stood at the desk of Vice President Mike Pence in the chamber of the U.S. Senate.

The detention memo, written by Justice Department lawyers in Arizona, goes into greater detail about the FBI’s investigation into Chansley, revealing that he left a note for Pence warning that “it’s only a matter of time, justice is coming.”

“Strong evidence, including Chansley’s own words and actions at the Capitol, supports that the intent of the Capitol rioters was to capture and assassinate elected officials in the United States government,” prosecutors wrote.