A Charleston man accused of leaving a series of threatening voice mail messages for U.S. Sen. John Boozman, R-Ark., will undergo a psychiatric exam to determine if he’s competent to stand trial.

Larry Joe Nixon, 66, is charged in U.S. District Court in Fort Smith with one count of interstate transmission of a communication containing a threat to injure a person. The charge carries up to five years in prison.

On May 28, FBI Special Agent Tim Akin received information that about 25 messages were left on the voice mail at Boozman’s Washington office between the close of business May 23 and the start of business May 27.

In addition to calling Boozman a sell out, power hungry and other insults, 10 messages contained threats directed at the senator, according to a list Akin mad.

"Each voice mail did not contain a threat; however, throughout the messages, Nixon sound intoxicated and did a lot of name calling," Akin wrote in an arrest warrant affidavit.

The threats included claims that the caller would sleep better if he could kill Boozman, a desire to torture him, the revelation he’s been thinking about killing all politicians for decades, a desire to kill all U.S. Senators, the justices of the U.S. Supreme Court and the president.

"Like I told you. My lil’ old brain been working for decades trying to figure out the magic plan, how to finally do that s—- and not go to the federal penitentiary," Nixon said, according to a transcript of one of the messages.

Federal agents tracked Nixon down through caller identification and interviewed him at his residence May 28.

Nixon admitted calling Boozman’s office, but told agents he didn’t know how many times he called or remember what he said, according to the affidavit.

After Akin read back a transcript of the threatening messages, Nixon told him "that is exactly how I feel," but said he should have left out the profanity.

Nixon also told Akin he takes significant amount of medication for schizophrenia and drinks with his medication, according to the affidavit. A relative of Nixon’s also told Akin that Nixon was acting more bizarre than usual lately, including threatening to kill his sister.

It was also discovered Nixon left a threatening message for U.S. District Court Judge Robert T. Dawson in 2011; called the Boston Marathon Bombing hotline in April 2013 and told an FBI agent he would hurt innocent people if he could get way with it; and called a Sirius XM Radio talk show in May 2013 and said he felt like a domestic terrorist, according to the affidavit.

In addition to schizophrenia, Nixon told Akin he also suffers from blackouts. He was on probation for burning down a man’s house, but he would never hurt anyone and doesn’t own a gun.

U.S. Magistrate Judge James Marschewski signed an order for the evaluation following Nixon’s initial appearance before him Thursday.