The House Committee on Oversight and Reform is wading into the ethics scandal that continues to balloon around Ward 2 Councilmember Jack Evans, asking the Metro board on Tuesday for more information about its investigation into ethics violations while he was chair of the board. In a scathing letter, ranking members of the committee called into question the board’s lack of documentation, suggesting that the ethics investigation may have been “simply a whitewash.”

“Among other accusations, Evans allegedly exploited his position on the WMATA Board and the D.C. Council to advance the interests of his personal clients,” reads a letter from Ohio Republican Jim Jordan and North Carolina Republican Mark Meadows, ranking members of the House Committee on Oversight and Reform, to new WMATA board chair Paul Smedberg. “We write to request more information about the conduct of former chair Evans, who had said that D.C. has ‘pulled [its] act together and is ready to become a state.'”

Evans is currently the subject of a federal probe into his conduct as chair of the Metro board and Ward 2 Councilmember. A number of federal agents raided his Georgetown home in June, and earlier this month the D.C. Council voted to strip him of his chairmanship of the powerful Finance Committee.

The Metro board began investigating Evans in March following several reports about potential conflicts of interest. The investigation was completed in May, but the results were unknown to the public for more than a month. The ethics board has said that it does not have any written documentation of the ethics investigation and its findings, and at first Evans publicly said that the committee had not found him guilty of committing any violations.

A short memo from Metro’s General Counsel, Patricia Y. Lee, contradicted Evans’ claims and eventually forced him to acknowledge that the committee had found him guilty of one ethics violation. In June, a 20-page memo written by the law firm that the Metro board retained to complete its investigation was released by the Washington Post, outlining multiple ethics violations. Shortly after the release of the memo, which stated that Evans “knowingly” flouted ethics rules, Evans resigned from the Metro board altogether.

Now, the House is apparently taking interest in the brouhaha, calling out the investigation’s lack of documentation.

“The law firm [retained by the board] concluded that Evans had committed several violations relating to his duty of loyalty to the WMATA Board, his duty to avoid conflict of interest, and his obligation not to use his office for personal gain,” reads the letter. “Although the ethics committee stated that its findings were ‘based on the fulsome results of the investigation including: review of the documents, presentations, records, and supporting materials,’ WMATA officials have said that a report documenting that probe and the evidence it collected ‘does not exist.’ The apparent lack of documentation about the investigation raises questions about whether this effort was a genuine one, or simply a whitewash.”

Metro board chair Paul Smedberg says he objects to that characterization of the investigation. “Back in March, the board initiated a review to be conducted by the ethics committee, and the committee did that review consistent with the code that we currently have. We found a violation, and the board member was sanctioned,” Smedberg says. He also points out that three of the four member of the ethics committee (himself included) signed a letter suggesting a regulation change that would require the committee to issue a written report of its findings in the future.

The committee is asking the board to provide all documents relating to the investigation into Evans, and all documents relating to the ethics committee’s decision not to produce written documentation of the investigation. It is asking for this information by 5 p.m. on July 30.

This story has been updated with comment from Metro board chair Paul Smedberg.