House Oversight and Government Reform Committee head Darrell Issa has subpoenaed the Bureau of Alcohol, Tobacco, Firearms, and Explosives for documents concerning its controversial storefront gun stings, complaining the committee’s repeated request for the information have been ignored.

“After more than a year of promised cooperation, multiple letters to you, and several unfulfilled document requests, I have no choice today but to issue the enclosed subpoena to compel the production of documents relevant to the Committee’s investigation,” the California Republican wrote Wednesday night to ATF Director B. Todd Jones, and reported by the Milwaukee Journal Sentinel Thursday.

Issa set a March 31 deadline.

The House committee probe, and a Department of Justice inspector general investigation, followed a Milwaukee Journal Sentinel investigation of the stings, dubbed Operation Fearless.