Nearly 800 former employees at the Environmental Protection Agency (EPA) have signed a letter to Congress demanding an end to the Trump administration's efforts to "extinguish U.S. climate change policy and leadership."

The letter, which the Environmental Integrity Project said was sent to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled McConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (R-Ky.) and other lawmakers, argues that Trump's policies would "diminish the U.S. in the eyes of the world."

"As we mark the 47th Earth Day this month, the Trump administration and its supporters in Congress are turning their backs on science and what it tells us about the gravest environmental problem of our times — climate change," reads the letter sent to 777 former EPA scientists, analysts, managers and others.

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The letter was sent ahead of a march focused on climate change slated to take place Saturday in Washington, D.C. That march comes on the heels of last weekend's March for Science in D.C. and other cities.

"Science must guide and speed our collective efforts to protect life on Earth from climate change," the letter argues. "We urge you to join us at the climate marches and heed that message by rejecting the Trump administration's climate denial policies."

EPA Administrator Scott Pruitt responded to the letter by accusing the former employees of trying to "throw stones from the sidelines."

"This doesn't distract us from our mission of protecting the environment and jobs," Pruitt said, according to the Washington Examiner.