Former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE reportedly used his private Gmail account hundreds of times to discuss matters related to his work.

The New York Post, citing documents obtained by a conservative watchdog group, reported Friday that Comey discussed FBI-related business with his chief of staff on about 1,200 pages of messages, 156 of which the paper obtained.

The Post noted that at least seven of the messages related to Comey's personal email correspondence were not released by the Department of Justice (DOJ) because they were deemed too sensitive.

The DOJ said the messages “disclose techniques and procedures for law enforcement investigations or prosecutions,” according to the Post.

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An additional 363 pages of emails weren't released because they either were related to agency communications or may have led to personal privacy concerns.

Representatives for the Justice Department and Comey didn't immediately return a request for comment from The Hill late Friday.

The New York Post said that The Cause of Action Institute, a conservative watchdog group, received the documents through a Freedom of Information Act Request.

Comey, whom President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE fired from the FBI in May 2017, has received scrutiny over his role in the investigations into Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's private email server and the Russia probe.

The Post noted that the emails it obtained involving Comey are related to communications between 2013 and 2017, adding that more emails are expected to be released soon. The emails reportedly focus on a range of issues, including the Clinton email probe.

The release comes just months after the DOJ's inspector general said Comey used a personal email to conduct government business.

“We identified numerous instances in which Comey used a personal email account to conduct unclassified FBI business,” the report stated.

Comey has said that he did not use the personal email for sensitive or classified information, asserting that his use of it was "incidental."

Clinton mocked Comey over his use of personal email for government business earlier this year, which he pushed back against.

"It was not about her use of a personal email system. It was about communicating about classified topics on that system when those topics have to be done on a classified system," he said at the time.