A group of academics and civic organizations is calling on the House Ethics Committee of the U.S. House of representatives to make public the results of an independent investigation into whether Azerbaijan paid for House lawmakers’ travel to Baku in a potential violation of House rules, Foreign Policy writes.

In January, the Office of Congressional Ethics (OCE), which is an independent body, initiated its review of the 2013 trip to Baku by 10 members of Congress and 32 staff members. It submitted its report to the Ethics Committee in May. On July 31, the committee announced its own investigation had found no violations on behalf of the lawmakers and their staff but declined to release the OCE’s report.

According to Craig Holman, a government affairs lobbyist at the advocacy group Public Citizen, it was the first time the Ethics Committee has not released an OCE report on active members of Congress, which can fundamentally undermine OCE.

Public Citizen group is one of the 10 signatories on a letter, urging the committee to make the OCE report public.

The House members in question are Rubén Hinojosa, Danny K. Davis, Jim Bridenstine, , Ted Poe, Sheila Jackson Lee, Rep. Yvette D. Clarke, Michelle Lujan Grisham, Leonard Lance and former Congressman Steve Stockman. Of these, Clarke is the only Ethics Committee member.

“Lingering over the controversy surrounding the trip is a May 13, 2015 Washington Post report about the confidential OCE investigation, which had determined “lawmakers and their staff members received hundreds of thousands of dollars’ worth of travel expenses, silk scarves, crystal tea sets and Azerbaijani rugs valued at $2,500 to $10,000…The Post also reported that the State Oil Company of the Azerbaijan Republic, SOCAR, channeled $750,000 through U.S.-based nonprofits to hide the source of funding for the conference,” the newspaper writes.