Stone is the latest Trump ally to be indicted or convicted - six in total - as a result of the Mueller investigation, most having to do with making false statements to investigators. Explicative-laden communications between Stone and Credico were often read aloud in court.
In the 1980s, Stone advised Trump as he weighed jumping into the political arena, and at one point arranged a weekend trip to meet with former President Richard Nixon.
Stone, 67, could face up to 20 years in prison. Trump denounced the verdict.
She set Stone's sentencing for February 6. He had been under a gag order that the judge in the case, Amy Berman Jackson, put in place earlier this year.
Perhaps hoping for a miracle, Stone was also clutching a bible in his left hand. Supporters were crying, and one was removed.
In a trial that lasted about a week, witnesses highlighted how Trump campaign associates were eager to gather information about emails the United States says were hacked by Russian Federation and then provided to the anti-secrecy website WikiLeaks.
Prosecutors say Stone lied to Congress about his conversations about WikiLeaks with NY radio host Randy Credico and conservative writer and conspiracy theorist Jerome Corsi.
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Prosecutors in the case said that Stone lied to Congress because the truth would have "looked terrible" for Trump and his campaign, The New York Times reported. Stone then lied to Congress about said activities.
Prosecutors requested Mr. Stone be immediately taken into federal custody.
Trump had said in a written reply to Mueller that he didn't recall any such conversations.
Prosecutors accused Stone of telling lawmakers five different lies related to WikiLeaks and its founder Julian Assange, which in 2016 disclosed a series of damaging emails about Democrat Clinton that U.S. intelligence officials and Mueller determined had been stolen by Russian hackers.
He said Stone bragged of his relationship with WikiLeaks and its founder, Julian Assange.
Ten months after his arrest by a swarm of Federal Bureau of Investigation agents, former Trump adviser and self-proclaimed "dirty trickster" Roger Stone was found guilty of all seven felony counts against him, including obstruction of Congress, five counts of false testimony to Congress, and witness tampering. But he started pressing Credico to broker a contact, and Credico testified he told Stone to work through his own intermediary.
Stone also urged Credico to emulate a character from "The Godfather Part II", Frank Pentangeli, who recants his testimony to Congress about mob boss Michael Corleone after being intimidated.
Both Stone and Credico have since said that Credico did not act as a WikiLeaks back channel. "Didn't they lie" Trump tweeted. Stone did not testify and his lawyers called no witnesses in his defence.