A U.S. Coast Guard officer arrested for planning a domestic terror attack "on a scale rarely seen in this country" was a supporter of a white ethnostate in the Pacific Northwest, a right-wing extremist trope that has been supported by Washington neo-Nazis for decades.

The FBI arrested Christopher Paul Hasson at his Maryland home on Friday, discovering a large cache of weapons and drugs inside his home. In court filings, investigators said Hasson was planning to kill prominent Democrats like Alexandria Ocasio-Cortez, and TV personalities like Don Lemon and Joe Scarborough.

Hasson also wrote a letter to an unidentified a neo-Nazi leader expressing his support for a Pacific Northwest whites-only state, according to court records.

Read more: Seattle Patch