(FOX NEWS) The Republican National Committee, just in time for Tax Day, is filing a lawsuit against the IRS over what it calls “illegal stonewalling” of its request for documents related to the agency’s targeting of conservative groups.

The RNC said in a statement on Tuesday that the agency, despite several extensions, has failed to produce the documents sought in a Freedom of Information Act request dating back to May 2013. The RNC requested the agency produce correspondence and documents relating to the targeting scandal, in which agents singled out conservative organizations for special scrutiny.

The RNC called the agency’s refusal so far to produce the documents “unacceptable and inexcusable.”

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