A senior House Republican has served a top FBI official with a subpoena for all the material from the bureau’s investigation into Hillary Clinton’s use of a private email server.

Rep. Jason Chaffetz of Utah said during a congressional hearing Monday that the failure to provide all the records from the case is preventing Congress from properly overseeing the executive branch. Clinton left the State Department in February 2013.

Chaffetz is the chairman of the Oversight and Government Reform Committee. He issued the subpoena to Jason Herring, the acting assistant director for congressional affairs.

The FBI last month provided portions of the file from its probe into whether Clinton mishandled classified information.

Republicans have said the documents “did not constitute a complete investigative file.”

(AP)