Texas Rep. Beto O'Rourke and House Speaker Nancy Pelosi are among the names on an apparent hit list compiled by a Coast Guard lieutenant arrested last week as a "domestic terrorist," authorities said.

Christopher Paul Hasson, who had reportedly drafted an email discussing biological attacks as well as the hit list of prominent Democrats and media figures, was arrested after 15 firearms and more than 1,000 rounds of ammunition were found in his basement apartment in Silver Spring, Md.

This image released by the US Attorney's Office shows weapons seized at the Silver Spring, Md., home of US Coast Guard officer Christopher Paul Hasson. Hasson, who espoused white supremacist views and drafted a target list of Democratic politicians and prominent media figures, was arrested on firearms and drug charges. (HO / Getty Images)

But prosecutors say Hasson has long held extremist views and add that the gun and drug offenses for which he will appear in federal court Thursday are just the "proverbial tip of the iceberg."

In court papers, they said Hasson, who works at Coast Guard headquarters in Washington, is "bent on committing acts dangerous to human life that are intended to affect governmental conduct."

For instance, the papers said, Hasson wrote in an email drafted in June that he was "dreaming of a way to kill almost every last person on the earth," wondering how to obtain anthrax and toxins to cause deadly outbreaks.

He also pondered bombings and sniper attacks, expressed admiration for Russia and in a draft letter to a neo-Nazi leader identified himself as a longtime White Nationalist, prosecutors said.

In addition to O'Rourke and Pelosi, Hasson's apparent hit list, created as a Microsoft Excel spreadsheet, included Senate Minority Leader Chuck Schumer and presidential candidates Kamala Harris, Elizabeth Warren and Cory Booker, as well as broadcast journalists Chris Hayes of MSNBC and CNN's Chris Cuomo.

With information from The Associated Press.