Special Counsel Robert Mueller has reached out to Roger Stone’s friend, comedian Randy Credico, for an interview, according to a Sunday Daily Beast report.

Credico told the Daily Beast he would not speak to Mueller unless he received a subpoena. He added that Stone and his allies have been accusing him of cooperating with Mueller, even claiming that he has worn a wire.

“There was a reason why I didn’t submit to a voluntary interview, and that is because I had already been pummeled by Stone and his crew as being a rat,” Credico told the Daily Beast.

Stone reportedly countered this claim. “I have only badgered him to tell the truth,” he said. “I have never urged him not to cooperate with any official inquiry—only to tell the truth.”

Credico was subpoenaed by the House in November.

Stone has reportedly told Congress that Credico was a backchannel between him and Julian Assange, prompting interest due to the Wikileaks release of emails during the campaign.

Credico reportedly denied Stone’s allegation.

Mueller seems to be bearing down on Stone and delved into his finances last month, according to CNN.