WASHINGTON (Reuters) -Two major environmental groups announced on Tuesday they have sued the Trump administration for secretly convening a group of climate skeptics, which prepared a report that served as the basis for a reversal of U.S. rules on greenhouse gas emissions without public notice. The Environmental Defense Fund and the Union of Concerned Scientists filed the lawsuit in a federal district court in Massachusetts, arguing that the so-called Climate Working Group that Energy Secretary Chris Wright put together, evaded public view, delivered erroneous results and was illegally used to inform the Environmental Protection Agency's decision to reverse the scientific finding that served as the foundation for federal climate regulation.