Former FBI Director James Comey is expected to testify at the Senate sometime next week about President Donald Trump allegedly telling him to end an investigation into his inner circle’s ties to Russia, CNN reports.

According to an unnamed source, Comey will testify in front of the Senate Intelligence Committee, which is investigating possible collusion between the Trump campaign and Russia. Though it’s unlikely Comey, who was fired by Trump earlier this month, will speak about the FBI’s investigation, CNN reports that he is willing to talk about his interactions with Trump. No official date has been confirmed for the hearing. Comey has also reportedly discussed his testimony with his predecessor at the FBI, Robert Mueller, the special counsel assigned to the Russia investigation in the wake of Comey’s firing.

The news of Comey’s reported public testimony next week comes after he had previously delayed a hearing with the House Oversight Committee.

Since taking office, Trump has repeatedly called the Russia investigation, and the coverage around it, a “witch hunt.”