Jay Allen Johnson was indicted last week on six criminal counts, including threatening to murder a U.S. official. He is accused of leaving death threats and other profanity-laced voicemails to Republican senators Lisa Murkowski and Dan Sullivan, as well as threatening to burn down Murkowski’s properties.

Other charges faced by Johnson include being a felon in possession of firearms and threatening interstate communications. He was convicted of drunk driving in 2016, making it illegal for him to own firearms. However, authorities are hoping to confiscate three revolvers, two pistols, a rifle and a shotgun from Johnson’s property.

Jason Weiner, Johnson’s attorney, claims that he sought to make a plea deal offer between him and the government prosecutor. However, that deal could not be finalized. Johnson previously testified that he had no intention to carry out the threats made toward Murkowski and Sullivan because he is “a senior citizen and…highly disabled.”

Johnson faces up to 30 years in prison and up to $1.5 million in fines if found guilty.

For more reporting from the Associated Press, see below.

A judge decided that he will remain in custody.

Weiner entered the plea on his client’s behalf during Johnson’s arraignment in U.S. District Court in Fairbanks.

Johnson at the hearing greeted U.S. Magistrate Judge Scott Oravec by saying: “Good morning, Happy Thanksgiving and I’m sorry I’m here today.”

Johnson is from the small community of Delta Junction.

Oravec last Friday ordered Johnson’s detention to continue during a separate hearing. On Monday, the judge said he saw no reason to “disturb that ruling at this point.”

Johnson’s wife, Catherine Pousson-Johnson, testified during her husband’s detention hearing in October that he was was in pain after recent surgeries and that he “gets very angry listening to politics on the news.”

Newsweek previously reported from the Associated Press that Johnson asked Murkowski in one of his voicemails if she knew what a .50 caliber shell can do to a human head. The senator’s spokeswoman, Karina Borger, had confirmed that her employer was the anonymously named senator in the arrest affidavit.

“Threats should be taken seriously and our laws should be enforced to ensure accountability,” Borger told the Associated Press. “Senator Murkowski is thankful for the hard work of the federal law enforcement and for all they do to keep us safe.”