Hunter Biden pleaded not guilty to three firearms charges during his appearance in a federal court in Wilmington, Del., on Tuesday.

In mid September, Special Counsel David Weiss indicted President Joe Biden’s son, alleging that Hunter lied on a federal form while purchasing a gun five years ago. The four-page indictment, filed in U.S. District Court in Delaware, argues that Hunter “knowingly made a false and fictitious written statement, intended and likely to deceive” a dealer in his effort to acquire a Colt Cobra revolver in October 2018.

The indictment accused Hunter of certifying on a federal Alcohol, Tobacco, and Firearms form that “he was not an unlawful user of, and addicted to, any stimulant, narcotic drug, and any other controlled substance, when in fact, as he knew, that statement was false and fictitious.” Biden’s addiction struggles have been in the public spotlight for years, a battle he has openly acknowledged in his memoirs.