President Donald Trump declared himself a champion of the environment Monday, working to boost his standing on climate change and pollution issues in advance of the 2020 election despite having launched some of the most sweeping rollbacks in air, water and other protections in decades. Former government regulators and environmental advocates said Trump's promotion of its environmental record strained credulity. "Trump's environmental record is such a toxic disaster it should be declared a Superfund site," said Carol Browner, who led the Environmental Protection Agency during the Clinton administration.