Representative Alexandria Ocasio-Cortez (D-NY) has stepped up to defend 17-year-old climate justice activist Greta Thunberg after the latest remarks by a member of President Donald Trump’s administration. The congresswoman known as AOC took to Twitter to share her support for the youth activist after Steven Mnuchin, Trump’s treasury secretary, entered into his boss’s beef with Greta.

Munchin was speaking in Davos, Switzerland, at the World Economic Forum, an event hosting over 100 of the world’s billionaires and where Greta is again a featured speaker. Mnuchin was asked about the question of fossil fuel divestment raised by Greta earlier this month, ahead of the Davos forum.

"After she goes and studies economics in college, she can come back and explain that to us," said Mnuchin, a man whose time in the financial sector earned him the nickname “Foreclosure King.”

Thunberg, who is taking a year off from school, took to Twitter to make clear she doesn’t need an advanced degree to keep focusing on the science that is at the center of her advocacy for action.

“My gap year ends in August, but it doesn’t take a college degree in economics to realize that our remaining 1.5° carbon budget and ongoing fossil fuel subsidies and investments don’t add up,” Greta wrote, including a video showing different projections of how reduced carbon emissions could slow global warming. (Reducing carbon emissions is one of Greta’s go-to talking points.)

She continued, “So either you tell us how to achieve this mitigation or explain to future generations and those already affected by the climate emergency why we should abandon our climate commitments.”

AOC also took to Twitter to weigh in on Mnuchin’s remarks. She explained that even though she graduated cum laude with a degree in international relations and economics in 2011, she knows all too well that academic credentials aren’t what really keeps people in power from listening.

“If you don’t have an economics degree like Greta, they’ll mock you for not having one. If you DO have one, as I do, they’ll claim it’s illegitimate,” she wrote. “Haters gonna hate & deniers will deny. They will deny logic, science, and environmental consensus in order to protect oligarchy.”

Ocasio-Cortez has been a vocal champion of a Green New Deal resolution in Congress, which seeks to dramatically reshape our economic systems to address the climate crisis. One of the resolution’s provisions is for all energy in the U.S. to be generated through “clean, renewable, zero-emission sources.”

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Want more from Teen Vogue? Check this out: For My Future College, Fossil Fuel Divestment Is a Must-Have So the Climate Crisis Doesn't Make My Education Useless