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Former FBI Director James Comey is expected to publicly testify before the Senate as early as next week about the claim that President Trump pressured him to end an investigation into former National Security Adviser Michael Flynn, who is at the center of ongoing inquiries into the Trump campaign's ties to Russia, CNN reports.

There is not yet an official date set for the testimony. A person familiar with the plans told CNN that Comey has already spoken to Special Counsel Robert Mueller about "the parameters for his testimony to ensure there are no legal entanglements as a result of his public account."

Comey was reportedly uncomfortable with Trump's pressuring; Trump has privately called Comey a "nut job."