A Connecticut man was indicted after authorities said he threatened to kill President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and sent Trump a substance he claimed was anthrax.

Authorities say Gary Gravelle, of New Haven, Conn., sent threatening letters containing a powdery white substance Gravelle said was anthrax addressed to Trump and a local Islamic center, among other locations, according to an indictment released Friday by the U.S. Attorney’s Office for the District of Connecticut.

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Gravelle also was identified as a member of the white separate organization American Knights of Anarchy, according to the New Haven Register.

The letter sent to Trump containing white powder read, “I, Gary Gravelle, ... as a faithful soldier of the AKA, am coming to KILLDonald Trump," according to the indictment.

Gravelle has been in custody since September of 2018 when he was arrested for allegedly violating the terms of his federal supervised release.

At least two of the letters Gravelle mailed last year contained baby powder and not Anthrax, officials said.

Gravelle is charged with a total 16 counts for maliciously conveying false information about explosives, false information and hoax as well as threats to the president. He could face more than 100 years in prison if he receives the maximum sentences for each charge.