A lieutenant in the U.S. Coast Guard has been arrested in Virginia on gun charges related to being a "domestic terrorist," the FBI said.

Christopher Hasson, a former Marine, was arrested on drug and weapons charges last week. Prosecutors allege he intended to murder civilians and had purchased several weapons. A search of his home in Silver Spring turned up 15 firearms and 1,000 rounds of ammo, according to the FBI.

He was also allegedly abusing the narcotic Tramadol and had supplies of HGH.

Prosecutors pointed to Hasson’s alleged extremist, hateful writings and said he wrote a draft letter to a known neo-Nazi leader, allegedly describing himself as a white nationalist for over 30 years.

From 2017 up until his arrest last week, he allegedly read writings of Norwegian Anders Breivik, who killed 77 people in the name of “Crusader Nationalism.”

Hasson was found out because he was allegedly researching gun purchases and hate groups on a Coast Guard computer, according to Justice Department officials.

NBC Washington reported that Hasson did not yet have a defense attorney and couldn't be reached for comment because he was in custody.

The feds said his Internet searches included things like "most liberal senators"; "do senators have (secret service) protection"; "are supreme court justices protected."

He allegedly also searched an MSNBC host and his homes, and where his show is filmed.

He allegedly compiled a list of Democratic congressional leaders, and MSNBC and CNN media personalities, as potential targets for an attack, including U.S. senators from New York, New Jersey and Connecticut.