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The push for documents has bipartisan support — though not necessarily Mr. Issa’s threat of a subpoena.

“I believe the committee has a right to these documents, and I hope we can work this out without resorting to a subpoena,” said Rep. Elijah E. Cummings of Maryland, the ranking Democrat on the oversight committee. “The agency should identify any sensitive material, and the committee should safeguard this information appropriately.”

In his letter, Mr. Issa said the committee has the experience and ability to protect sensitive data.

Mr. Issa first requested unredacted OPM documents in September, including the full 2007 background investigation report that approved Alexis‘ security clearance.

Alexis used that clearance in September to gain access to the Navy Yard facility, where he killed a dozen people and wounded eight others before he was fatally shot by police.