A Connecticut man was accused of threatening to kill President Trump and mailing menacing letters containing what he claimed was Anthrax to several locations, including a synagogue and a mosque.

Gary Gravelle, 51, was indicted Friday on 16 counts, including making threats to the president, hoax and maliciously conveying false information about explosives, the United States Attorney for the District of Connecticut John H. Durham said in a release.

Gravelle — who is also known as Ronald Prejean — was identified in the indictment as a member of the white separatist organization American Knights of Anarchy or AKA, according to the New Haven Register.

In a Sept. 2018 letter to Trump, he wrote, “I Gary Gravelle… as a faithful soldier of the AKA am coming to KILL Donald Trump,” according to the indictment.

Gravelle also allegedly sent letters containing white powder he claimed was anthrax to the synagogue Congregation Adath Israel in Middletown. The letter he allegedly sent to the Islamic Center in New London contained the powder and a note saying “You Die.”

Officials said at least some of the letters contained baby powder and not Anthrax.

During that same time period, Gravelle allegedly sent threatening emails and made calls saying he was going to detonate bombs at several locations, including Burlington International Airport in Vermont, the Federal Detention Center, SeaTac in Seattle and a New Haven Conn., support group for adults with mental illnesses.

He faces a possible maximum sentence of 100 years in prison.