A Republican senator says the FBI is improperly restricting access to materials from its closed investigation into Hillary Clinton's use of a private email server.

Democratic candidate for President Hillary Clinton. (Photo by Jeff Swensen/Getty Images)

Senate Judiciary Committee Chairman Chuck Grassley wrote to the chamber's security director asking that unclassified portions of the FBI documents be provided to his staff.

The move appears to be an end run around strict restrictions imposed by the FBI, which warned members of Congress not to leak documents from its investigation involving the Democratic presidential nominee.

Congressional aides said Wednesday the investigative materials demanded by House Republicans are being kept in a secure room on Capitol Hill typically reserved for the nation's most closely guarded secrets.

Democrats say they will comply with the FBI's request not to release any without the agency's permission.

(Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)


Sign up for the NJ1015.com Newsletter

Get the best of NJ1015.com delivered to your inbox every day.