In announcing the repeal, Pruitt made numerous same arguments that he had made for years to Congress and in lawsuits: that the Obama administration exceeded its legal authority in an effort to limit greenhouse gas emissions from power plants.
"The Clean Power Plan departed from this practice by instead setting carbon dioxide emission guidelines for existing power plants that can only realistically be effected [sic] by measures that cannot be employed to, for, or at a particular source", Bloomberg quoted from the unreleased documents.
"I'm excited to be with you here today because it's not just to visit about all the things we're doing which I think is very, very important for this country", Pruitt said Monday morning at an event in Hazard, Kentucky.
The leaked document casts doubts on those numbers and says the EPA plans to perform updated modeling and analysis of health benefits and other impacts of the rule. They were using every bit of power, every bit of their authority to use the EPA to pick winners and losers in how we generate electricity in this country.
The Trump administration will put forward this argument to allege the Clean Power Plan violates the law, Bloomberg News reported.
Environmental groups were sharp in their denunciation of Pruitt's announcement.
Trump, like Pruitt, has refused to support the scientific consensus about man-made climate change and its risks for the planet.More news: Amber Alert issued for Dallas-area girl
More news: Steelers who helped vs. the Jaguars, 3 who didn't
More news: Why India U-17 coach is 'not happy' with his team's showing
Pruit framed the Clean Power Plan - a rule limiting greenhouse gas emissions from power plants - as an overstepping of federal authority that unfairly targeted power plants and the waning coal industry.
The Clean Power Plan was never enforced.
President Donald Trump, who appointed Pruitt and shares his skepticism of established climate science, promised to kill the Clean Power Plan during the 2016 campaign as part of his broader pledge to revive the nation's struggling coal mines.
The proposal also says the EPA has yet to determine whether it will create an additional rule on the regulation of greenhouse gases. While attorney general for Oklahoma, Pruitt sued the EPA 14 times for what he described as "overreach".
The EPA won't prescribe an immediate replacement to the plan, but will seek public comment on whether to curb climate-warming emissions from coal and natural gas power plants.
Prior to the finalization of the rules in August 2015, power plants - which account for almost 40 percent of carbon emissions - "were allowed to dump unlimited amounts of carbon pollution into the atmosphere", said the Union of Concerned Scientists.