While the Daily Caller received emails through a FOIA request indicating that Treasury was deeply involved in that decision, Camp has yet to receive anything close to that level of information in response to his request.

"Despite the Administration's early commitment to provide 'an unprecedented level of openness in Government,' the Department of Treasury's response of September 7, 2012, was incomplete and inadequate," Camp wrote in a letter to Treasury Secretary Tim Geithner that he sent Wednesday.

"My request was straightforward, seeking documents that likely have already been collected pursuant to Freedom of Information Act (FOIA) requests and Delphi-related civil litigation," he added. "As you are aware, responses to Congressional requests are not limited by FOIA exemptions or common law privileges, thus all documents should have been produced without redaction or limitation."

He said emails already shown to his committee show that Treasury was "heavily involved" in the Delphi decision, including by commenting on draft settlement agreements. But Camp said that without full compliance from Treasury, "the full extent and propriety of Treasury's involvement is impossible to determine."

In addition to Geithner, Camp sent a similar letter to White House counsel Kathryn Ruemmler. Both letters give officials until Oct. 12 to provide him with all emails and documents related to Delphi, but does not say what action Camp might take if that deadline is missed.