A powerful coalition of conservatives, retired military brass and parents of two victims of the 2012 killings at the U.S. diplomatic facility in Benghazi, Libya are calling on House Speaker John Boehner to set up a special panel to probe the affair and former Secretary of State Hillary Clinton’s role in it.

“Mr. Speaker, we call upon you to act now and create a Select Committee on Benghazi to investigate all aspects of the United States involvement in Libya, to include, but not be limited to the attacks of September 11, 2012,” said the letter to Boehner. It was provided to Secrets on Monday.