California Gov. Jerry Brown (D) ripped President Trump for his recent remarks on North Korea and compared Trump’s supporters to “people who dwell in deep, dark caves.”

Speaking at a climate change event in New York City, Brown criticized Trump for his weekend tweet aimed at North Korean leader Kim Jong Un.

“Everything he’s doing is … stupid and dangerous and silly. I mean, come on, really, calling the North Korean dictator 'Rocket Man'?” Brown said, according to Politico. “He is accelerating the reversal through his own absurdity.”

Brown also mocked supporters of Trump, saying they most resemble “troglodyte[s].”

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“You should check out the derivation of ‘Trump-ite’ and ‘troglodyte,’ because they both refer to people who dwell in deep, dark caves,” Brown said.

Monday’s speech was the first of several climate-change events the Democratic governor will hold this week as Trump meets with world leaders at the United Nations, according to the Los Angeles Times.

Brown has led the charge against Trump’s policies on climate change since the president announced he was pulling the U.S. out of the Paris climate change agreement earlier this year.

California joined Washington and New York in forming the “U.S. Climate Alliance” to uphold the goals of the Paris climate change agreement in the days following Trump’s announcement.

Brown also inked a deal to work directly with China to lower greenhouse gas emissions and improve vehicle fuel efficiency in June.

The Democratic governor’s comments follow a flurry of legislative activity in California that saw the state legislature step up its opposition to Trump. Legislators passed bills making California a “sanctuary state” and formally urged Congress to censure Trump over his comments following the white supremacist rally in Charlottesville, Va., last month.