Actor George Clooney mocked the Trump administration on the issue of climate change in a video aired Tuesday on ABC's "Jimmy Kimmel James (Jimmy) Christian KimmelFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Kimmel-hosted Emmy Awards attract all-time low 6.1M viewers: 'Well, we set a record' Bubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team MORE Live!," joking that being "dumb" about the issue had become "contagious" across the administration.

In a mock public service announcement for the late-night show, Clooney introduced himself as "actor, director and two-time sexiest man alive" before launching into attacks against "dumb f---ing idiots" in the White House and elsewhere in the administration.

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As he said the words, images of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's top aides, including White House press secretary Sarah Huckabee Sarah Elizabeth SandersSarah Sanders on Trump's reported war dead criticism: 'Those comments didn't happen' Sarah Sanders memoir reportedly says Trump joked she should hook up with Kim Jong Un McEnany stamps her brand on White House press operation MORE Sanders, as well as Sen. James Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (R-Okla.), a vocal climate change skeptic, appeared on screen.

"Tragically, though, the volumes of invaluable knowledge gathered over centuries are now threatened by an epidemic of dumb f---ing idiots saying dumb shit," Clooney said, to laughter.

"As a result, rampant dumbf---ery now threatens our health, our security, and our planet," Clooney added.

Clooney is a vocal critic of the Trump administration and has battled the White House publicly on issues such as gun control following last year's shooting at a high school in Parkland, Fla.

“We both feel very strongly that this is your march. Your moment,” Clooney wrote to students at Marjory Stoneman Douglas High School following the founding of the March for Our Lives movement last year.

“You make me proud of my country again,” he added in the note published in The Guardian.

He has also previously taken aim at Trump's campaign trail rhetoric, particularly surrounding immigration.

“I was watching a lot of speeches on the campaign trail about building fences and scapegoating minorities,” the actor said in 2017 at the Venice Film Festival, adding at the time: “There is a dark cloud hanging over our country right now."