In order to speed up the transmission of a set of talking points, Hillary ClintonHillary Rodham ClintonTrump: Muslim soldier was a hero but his father 'has no right' to criticize me Interim DNC chair to impose 'tough standards' after email leaks Mark Cuban campaigns for Clinton in hometown of Pittsburgh MORE asked an aide to send information to her through a “nonsecure” channel.
“They say they’ve had issues sending secure fax,” Sullivan says. “They’re working on it.”
“If they can’t, turn into nonpaper w no identifying heading and send nonsecure,” Clinton responds.
It is not clear what the contents of the email were, whether information sent was classified or secure or whether the order was carried out.
The Clinton campaign did not immediately respond to a request for comment.
Sen. Chuck Grassley (R-Ia.) chairman of the Senate Judiciary Committee, called the email "disturbing."
"The State Department's latest Freedom of Information Act release contains a disturbing email that appears to show the former Secretary of State instructing a subordinate to remove the headings from a classified document and send it to her in an unsecure manner," he said in a statement on Friday.
"It raises a host of serious questions and underscores the importance of the various inquiries into the transmittal of classified information through her non-government email server," he added.
The Select Committee on Benghazi also took credit for bringing Clinton's private server to light.
"Of course, none of the Secretary of State's emails – including one in which she appears to instruct a top aide to strip a document of its 'identifying heading and send nonsecure' instead of via classified, secure fax – would have been discovered if not for the work of the Select Committee on Benghazi," Communications Director Jamal Ware said in a statement on Friday.
The Democratic primary front-runner is under investigation by the FBI for using a private email server during her tenure at State.
Republicans have accused Clinton of compromising classified data and putting national security at risk by using a non-governmental device to transmit and receive her emails.
The State Department released a new batch of 3,007 emails on Friday, in which it said 66 were classified. The total number of classified messages received from Clinton’s server is now up to 1,340.
Clinton has denied knowingly transmitting or receiving classified information.
Eighty-two percent of the emails have been released to the public so far. The rest are slated to be made available at the end of the month.
-Updated at 3:33 p.m.