(CNN) Thirty members of Congress have reviewed largely unredacted copies of the highly sensitive surveillance-warrant applications on Trump campaign foreign policy adviser Carter Page, but House Intelligence Chairman Devin Nunes still has not -- despite having issued a subpoena for the documents last year and more recently calling on President Donald Trump to declassify large swaths of the materials.

According to Justice Department officials, the California Republican has been offered opportunities to review the materials at a secure location at the department for months, but he has not come. Instead, he has sent committee staff and Rep. Trey Gowdy, a South Carolina Republican who's the chairman of the House Oversight Committee, in his place.

CNN first reported in May how Nunes, after threatening Deputy Attorney General Rod Rosenstein with contempt of Congress for failing to produce an unredacted copy of the document formally authorizing the FBI's investigation into Russian interference in the 2016 US election, opted not to read it when it was sitting in front of him. CNN reported at the time that Nunes had not read the Foreign Intelligence Surveillance Act application and other classified materials he had demanded.

Yet Nunes refused to say Monday whether he had read the FISA materials when asked -- and attacked CNN instead.

Asked Wednesday by CNN why he still hasn't read the documents, Nunes declined to respond.

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