New York radio host Randy Credico, with a dog in tow, testified Friday about his relationship with Roger Stone before a grand jury working with special counsel Robert S. Mueller III’s probe into Russian interference in the 2016 presidential campaign.

Credico, an associate of Stone, a longtime adviser to President Trump, declined to discuss specifics after his appearance but acknowledged some of prosecutors’ interest regarded statements by Stone that Credico was his conduit to communicating with Julian Assange, founder of the anti-secrecy group WikiLeaks, which released hacked Democratic emails.

Asked how much of the questioning dealt with Assange, Credico answered “Very little,” before being cut off by his attorney, Martin R. Stolar, who said, “Don’t.” Asked if he was questioned by prosecutors about Stone’s statement, Credico said, “You don't need me to answer that,” saying he publicly denied being an intermediary in an MSNBC interview in March.

“Mr. Credico’s testimony was concerning his relationship with Roger Stone,” Stolar said, adding that he turned over no documents. “We’ll see if they want to talk to us again. They might want to ask us about some emails . . . We’ll see what happens.”

Credico and his attorney addressed reporters at the federal courthouse in Washington after receiving a subpoena last month to testify. Credico said he declined an offer to meet voluntarily with investigators. He said he received permission to bring his white Coton de Tulear therapy dog, Bianca, into the grand jury room.

Credico’s testimony came as an attorney for another Stone associate, conservative political commentator Jerome Corsi, said he would not be appearing before the grand jury Friday after being subpoenaed.

Corsi’s attorney, David Gray, declined to further comment Friday. Gray had said earlier in the week that he would be speaking to the special counsel’s office on Thursday and hoped to negotiate a voluntary interview for his client in lieu of a grand jury appearance.

Gray has said the subpoena indicated that Mueller is interested in Corsi’s communications during 2016 and 2017. Gray said he believes the special counsel planned to ask about Corsi’s contacts with Stone, who has come under intense scrutiny by Mueller’s investigators.

Corsi shared research with Stone around the same time that Stone claimed publicly that he had been in contact with Assange and had advance knowledge of WikiLeaks’ releases of the hacked emails.

Stone has since denied direct contact with Assange and said he had no specific knowledge of WikiLeaks’ material or the group’s plans to release it.

Gray has said Corsi had no contacts with WikiLeaks. He would not comment on what Corsi’s communications indicate about Stone or his interactions with WikiLeaks.

This summer, other Stone associates have been interviewed or asked to appear before the grand jury.

One Stone aide, Andrew Miller, has been held in contempt of court for refusing to comply with a grand jury subpoena and is seeking to have Mueller’s investigation declared unconstitutional.