The FBI'S deputy director, Andrew McCabe, will appear for a closed-door interview on Thursday with two key U.S. congressional committees, after Republicans asked him to discuss the bureau's handling of its Hillary Clinton email probe.

The Justice Department confirmed in a letter on Wednesday to the chairmen of the House of Representatives Judiciary and Oversight committees that McCabe will sit for a transcribed interview, but said McCabe will not be permitted to discuss anything related to Special Counsel Robert Mueller's investigation into Russian meddling in the 2016 presidential election.

It said the interview must be conducted in a classified setting and that the transcript should not be publicly released.