Knowing that the U.S. Environmental Protection Agency (EPA) has issued the most and the costliest regulations over the last decade, President Donald Trump’s focus on rolling back federal agency rules appears to be hitting EPA the hardest. Many of Trump’s executive orders during his first 100 days have focused on environmental matters; such as those that seek to expedite environmental reviews and permitting for infrastructure work and others that direct agencies to review (and then revise or repeal) key Obama-era rulemakings and practices (e.g., “Waters of the United States” definition, Clean Power Plan, mitigation policies and practices under the Endangered Species Act).