Reps. Bob Goodlatte (left) and Trey Gowdy (at right) are two Republican committee chairman facing criticism from conservatives in their own party.
CNN  — 

Last October, two House Republican committee chairmen announced their plans to get to the bottom of the FBI’s decision-making in 2016 – namely its handling of the Hillary Clinton email investigation.

“Decisions made by the Department of Justice in 2016 have led to a host of outstanding questions that must be answered,” Reps. Bob Goodlatte, chairman of the House Judiciary Committee, and Trey Gowdy, chairman of the House Oversight Committee, said at the time.

But eight months later, the joint investigation has yet to answer many of those questions – and prompted a growing amount of grumbling from Republicans themselves.

Several Republicans who serve on the two panels told CNN they are dissatisfied with the pace of the investigation, saying the chairmen have been slow to schedule witness interviews and have held marathon sessions with just four witnesses who have shed little light on both the Clinton investigation and the start of the FBI’s Russia probe in 2016. They gripe that the chairmen have not pushed the Justice Department harder on their subpoenas to get access to more documents. And some want to have their witness hearings in public settings, rather than behind closed doors as they have been so far.