Former Special Counsel Robert Mueller has asked Democrats on the House Judiciary Committee to swear in his longtime deputy as a witness at a congressional hearing on Wednesday, according to multiple reports.

Mueller asked that Aaron Zebley, who served as deputy on the special counsel’s probe, be sworn in as a witness in order to address any questions that he is not able to answer, The New York Times and CNN reported.

Mueller is scheduled to testify before the House Judiciary Committee for three hours, and before the House Intelligence Committee for two hours. He will be pressed for details of his 22-month investigation into whether the Trump campaign colluded with Russia, and whether President Trump attempted to obstruct the probe.

In a report of the investigation, Mueller said that his team was unable to establish that any Trump associates conspired with the Russian government to influence the election. But the report was vague on obstruction. Mueller declined to charge Trump on obstruction, but also said that the Republican was not exonerated by the investigation.

In response to Mueller’s request for guidance ahead of his testimony, the Justice Department said on Monday that the former FBI director has to stay “within the boundaries” of the public version of his repot.

It is not entirely clear why Mueller seeks Zebley’s assistance at the hearings. It is also unclear whether House Judiciary Committee Chairman Jerry Nadler had approved the last-minute change. The hearing schedule currently lists Mueller as the only witness.

Zebley was Mueller’s right-hand man on the special counsel’s team, and also served as chief of staff to Mueller when he was FBI director. Zebley has been criticized by some Trump supporters because he represented former Clinton aide Justin Cooper in the investigation into Hillary Clinton’s use of a private email server.

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