Nineteen Democratic senators issued a letter to EPA administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE on Thursday, questioning his methodology and logic for repealing the Clean Power Plan.

"At seemingly every turn, the 2017 Repeal proposal uses mathematical sleights of hand to over-state the costs of industry compliance with the 2015 Rule and understate the benefits that will be lost if the 2017 repeal is finalized," the letter reads, referring to the repeal of former President Obama's landmark climate change policy.

19 Senators say Pruitt's EPA used skewed science, math to justify repealing the Clean Power Plan, now they want the agency to show its work. pic.twitter.com/BWxVcr2J1r — Kyle Griffin (@kylegriffin1) October 26, 2017

"Denying the science and fabricating the math may satisfy the agency's paperwork requirements, but doing so will not satisfy the requirements of the law, nor will it slow the increase in frequency and intensity of extreme weather events, the inexorable rise in sea levels, or the other dire effects of global warming that our planet is already experiencing," the senators wrote.

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The letter specifically questions the repeal's stance on the health effects of pollution, its overstatement of the cost of the Clean Power Plan, and the understatement of the plan's benefits.

The list of signatories includes Sens. Kamala Harris Kamala HarrisJoe Biden looks to expand election battleground into Trump country Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE (D-Calif.), Richard Blumenthal (D-Conn.) and Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.).

The senators' letter comes after the Trump administration announced earlier this month that it would repeal the rule, which was a key component of the U.S. commitment to reduce emissions under the Paris climate change accord.

“The Clean Power Plan, it wasn’t about regulating to make things regular,” Pruitt said, adding "It was truly about regulating to pick winners and losers.”

Pruitt argued that the rule exceeded the previous administration’s authority and treated coal communities unfairly.