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The two Republican members of the Federal Communications Commission have refused to give Congress documents needed to complete an investigation into the FCC’s net neutrality rulemaking process, according to a lawmaker.

“Your refusal to cooperate with the Committee’s request is unacceptable, it obstructs our investigation, and it prevents the Committee from having a complete or accurate understanding of the circumstances surrounding this rulemaking,” US Rep. Elijah Cummings (D-Maryland) wrote in a letter to FCC Commissioners Ajit Pai and Michael O’Rielly yesterday.

There are “serious questions” about “Pai’s efforts to organize opposition to the proposed rule with outside parties,” Cummings’ office said in a related press release.