A "substantial amount" of what the FBI sent to Congress appears to be unclassified, meaning it could potentially be released publicly, The Washington Post report ed Wednesday.

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“If it isn’t classified, it ought to be public,” Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP set to release controversial Biden report McConnell locks down key GOP votes in Supreme Court fight Senate Republicans face tough decision on replacing Ginsburg MORE (R-Iowa) told the Post.

Grassley is calling for Senate officials to separate classified and unclassified material but said it might take a significant amount of time to do so, according to the newspaper.

The FBI was expected to turn over a federal form with interview summaries, known as 302s, offering notes on Clinton's three-hour-plus interview and others.

The FBI turned over a 32-page document to lawmakers on Tuesday with interview summaries for Clinton and top aide Huma Abedin, according to the Post.

For now, lawmakers can only review the material in a secure Sensitive Compartmented Information Facility.

Dozens of Republicans had demanded that the FBI hand over its report on the Clinton interview, which wasn't recorded nor conducted under oath, in keeping with FBI policy.

The FBI said in a statement Tuesday that the information was "being provided with the expectation it will not be disseminated or disclosed without FBI concurrence."

Clinton's campaign has called for the notes turned over to lawmakers to be released widely to the public in order to avoid "selective, partisan leaks" of information.

Clinton campaign chairman John Podesta tweeted Wednesday night that he was hearing from people already fielding calls over the content of FBI notes from their interviews:

Already hearing from people who have been contacted by reporters with knowledge of the content of their interviews in FBI 302's. (1/2) — John Podesta (@johnpodesta) August 17, 2016