A former Coast Guard lieutenant who described himself as a white nationalist was sentenced Friday to more than 13 years in prison after pleading guilty last year to federal gun and drug charges.

The former lieutenant, Christopher Paul Hasson, had plotted to kill journalists, Democratic politicians, professors, Supreme Court justices and those he described as “leftists in general,” federal prosecutors said in a previous court filing.

He was arrested in Maryland last February and pleaded guilty in October to four federal charges, including unlawful possession of unregistered silencers, unlawful possession of firearm silencers unidentified by serial number, possession of firearms by an addict to and unlawful user of a controlled substance, and possession of a controlled substance.