FILE PHOTO: U.S. political consultant Roger Stone, a longtime ally of President Donald Trump, speaks to reporters after appearing before a closed House Intelligence Committee hearing investigating Russian interference in the 2016 U.S. presidential election at the U.S. Capitol in Washington, U.S., September 26, 2017. REUTERS/Kevin Lamarque/File Photo

(Reuters) - Roger Stone, a longtime ally of U.S. President Donald Trump, allegedly called an associate “a rat,” threatened his dog and invoked “The Godfather” Mafia movies in a bid to stop him from testifying in an investigation run by U.S. Special Counsel Robert Mueller’s office, according to court papers unsealed on Friday.

Stone was arrested in Florida on Friday and accused of lying to congressional investigators and tampering with a witness.

Prosecutors accuse the political provocateur of threatening an associate who hosted a radio program in an apparent attempt to stop the unnamed person from testifying to investigators probing Russian influence in the 2016 U.S. presidential election.

The 24-page indictment is peppered with alleged threats, some with typos or grammatical errors, from Stone to the unnamed associate:

* “You are a rat. A stoolie. You backstab your friends-run your mouth my lawyers are dying Rip you to shreds,” Stone told the person in an April 9 email. He also threatened to “take that dog away from you,” and said, “I am so ready. Let’s get it on. Prepare to die (expletive).”

* “If you testify you’re a fool. Because of tromp I could never get away with a certain (sic) my Fifth Amendment rights but you can. I guarantee you you are the one who gets indicted for perjury if you’re stupid enough to testify,” Stone told the person in a Dec. 1, 2017, text message.

* “You are so full of (expletive). You got nothing. Keep running your mouth and I’ll file a bar complaint against your friend,” Stone wrote in a May 21 email.

* Another Dec. 1 2017 message referred to a character in “The Godfather: Part II” who declines to testify to Congress after mobsters bring his brother from Italy to the hearing in an apparent threat to the man’s safety. Court papers said that Stone told the person to “do a ‘Frank Pentangeli.’”

(This version of the story was refiled to add dropped word in headline)