(JTA) — Sam Nunberg, a former aide to President Donald Trump, said he is cooperating with a probe on Russian intervention in the elections.

Nunberg, who is Jewish, earlier this week said he would ignore a subpoena to appear before a jury sent to him by Special Counsel Robert Mueller’s investigation. But on Wednesday, he told WABC Radio: “I’m not holding anything back.” Complying, he added, “was much easier to do than I initially thought.”

Nunberg has already turned over all materials requested to Mueller, he said.

Nunberg confirmed during the interview that he had surrendered to Mueller’s team a trove of communications — including texts and emails between 10 campaign associates and President Trump — ahead of the Wednesday evening deadline.

Nunberg additionally said he was fully prepared to testify before a grand jury on Friday.

“I’m not going to take the fifth on anything, because I don’t need to take the fifth on anything,” he said. “I’m going to answer every single question.”

Nunberg, who was fired by the Trump campaign in the summer of 2015 over racist Facebook posts, told The Washington Post on Monday that he was asked to appear Friday before the grand jury. According to the newspaper, he also sent an email list from Mueller’s office requesting his appearance.

The subpoena seeks correspondence and “records of any kind” related to Trump and nine others, notably two former top advisers to Trump, Steve Bannon and Roger Stone.

Nunberg initially said he would provide neither testimony nor documents.

“Let him arrest me,” Nunberg told The Washington Post in an interview. “Mr. Mueller should understand I am not going in on Friday.”

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