In prickly back-and-forth exchanges, Buschel tried to poke holes in his testimony by suggesting Credico tricked Stone into believing he was an intermediary to Wikileaks, such as one text in which he claimed Wikileaks had "kryptonite" on Clinton.
Earlier this week, a former Federal Bureau of Investigation agent testified about a flurry of phone calls between Stone and then-candidate Trump - including three calls on July 14, 2016 - the day that a massive hack of the Democratic National Committee's servers was reported.
"He told me he had a relationship" with Assange, Bannon said, when asked by the prosecution why he chose to email Stone to ask why the news conference had been a dud.
Bannon could not name another person affiliated with the Trump campaign who claimed to be in contact with WikiLeaks besides Stone. "But Roger would be considered if we needed an access point", Bannon said.
Stone - a self-described "dirty trickster" and "agent provocateur" - has pleaded not guilty to charges of obstructing justice, witness tampering and lying to the U.S. House of Representatives Intelligence Committee in its investigation into Russian Federation interference in the 2016 election.
U.S. intelligence agencies and former Special Counsel Robert Mueller determined that the emails were stolen by Russian state-backed hackers as part of Moscow's efforts to meddle in the election and boost Trump's candidacy.
Stone told the House committee in sworn testimony that he had never communicated with any members of Trump's campaign about WikiLeaks or Julian Assange.
In 2016, WikiLeaks released damaging stolen emails from Hillary Clinton's campaign.
Bannon said he had been interviewed several times by special counsel Robert Mueller's team, which was investigating Russian interference in the 2016 presidential election and potential coordination with the Trump campaign.
In reluctant testimony, former campaign CEO Steve Bannon told a federal court that Stone, on trial for lying to Congress and witness tampering, had boasted about his ties to WikiLeaks and its founder Julian Assange, alerting them to pending new batches of damaging emails.
"I was forced and compelled to come here today", he said as he climbed into a waiting SUV outside the courthouse.
"He wanted me to go along with this narrative", Credico said in his second day of testimony. A stoolie... My lawyers are dying to rip you to shreds. He says Stone used repeated references from the movie "The Godfather Part II" to intimidate him into either backing up Stone's testimony to Congress or refusing to testify.
"I'm not sure they understood the political ramifications and political nature of this case", said Stone. Despite their political differences, Stone was a regular guest on Credico's radio show.
Credico's statement that he did not view Stone's threat against the dog as honest may undercut the government's claim of criminal intent, but the jury will also weigh many other comments and threats by Stone including one in which he said, "Prepare to die". "Yes", Credico said, challenging the attorney's failure to provide specific dates for events and even whether a text message technically counts as a conversation.
"I don't think he was going to steal the dog", Credico said, during a cross-examination by Stone's defense attorney, Robert Buschel. When describing his efforts to leave a letter for WikiLeaks founder Julian Assange at the Ecuadorian Embassy in London, where he was living at the time, Credico joked that when he walked through the embassy doors, "a hand reached out - it was like "Thing" from The Addams Family".
Credico has occasionally provoked laughter in court and warnings from the judge. "He plays hardball. He throws a lot of junk".