Houston, 8 June (Argus) — US senators this week pressed the Environmental Protection Agency (EPA) for communications between the regulator and presidential adviser Carl Icahn, the latest development in months of questions about the investor's role shaping policy that affects his businesses.

Five Democratic senators requested the EPA provide them all communications between regulatory officials in the agency and Icahn or individuals working on the behalf of Icahn or CVR Energy, a US independent refiner of which the New York investor owns at least 80pc.