States with a history of fighting air pollution generated by coal-fired power plants criticized a move by President Donald Trump's administration to scale back federal restrictions on emissions, with some threatening court challenges. Illinois Attorney General Lisa Madigan was among those who pledged to "take legal action to ensure the federal government does its job" to protect the environment and people's health. She warned the Republican administration's move will have "disastrous consequences." New York Attorney General Barbara Underwood also vowed to sue the Environmental Protection Agency if the plan is approved. "If the Trump administration's proposal to dismantle the Clean Power Plan is adopted, we will work with our state and local partners to file suit to block it -- in order to protect New Yorkers, and all Americans, from the increasingly devastating impacts of climate change," Underwood said. Both attorneys general are part of a coalition that includes officials from 15 other states, the District of Columbia, four cities and one county who defend former President Barack Obama's 2015 Clean Power Plan. That plan requires reductions in climate-changing emissions from fossil-fuel-burning plants. Two other states and the city of Los Angeles also joined in comments the coalition filed in April opposing the repeal of the Clean Power Plan.