A senior State Department official allegedly tried to have the FBI change the classification of emails during the Hillary Clinton investigation.

Republican Congressman Jason Chaffetz claimed at least one email was the subject of an 'alleged quid pro quo' involving the authorities and State Department Undersecretary for Management Patrick Kennedy, according to Fox News.

'In return for altering the classification, the possibility of additional slots for the FBI at missions overseas was discussed,' Chaffetz said.

Republican Congressman Jason Chaffetz claims a senior State Department official tried to have the FBI change the classification of emails during the Hillary Clinton investigation

Republican Congressman Jason Chaffetz claims new documents show Patrick Kennedy (pictured) was in an 'alleged quid pro quo' with the FBI

The alleged revelation is included in new documents relating to the investigation, Chaffetz claims.

The Utah Congressman told Fox he has not read the documents, and is basing his comments off what he has been told by staff members.

'Both myself and Chairman Devin Nunes of the House Permanent Select Committee on Intelligence are infuriated by what we have heard,' he told the news network.

'Left to their own devices the FBI would never have provided these [records] to Congress and waited until the last minute. This is the third batch because [the FBI] didn’t think they were relevant.'

The Congressman then said he would expect there to be 'four hearings' or more in the wake of the alleged incident.

The same allegation has surfaced against Kennedy before, and he has categorically denied it.