Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE on Thursday accused Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE's campaign of lying about her in a heated exchange with an environmental activist.

“I am so sick of the Sanders campaign lying about me. I’m sick of it,” the visibly angry Democratic presidential hopeful said, pointing a finger in a woman’s face, in a video posted by Greenpeace.

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The exchange came as the woman pressed Clinton on taking donations from the fossil fuel industry and asked if she would reject their campaign contributions in the future.

“I do not have — I have money from people who work for fossil fuel companies,” Clinton responded, before calling the rival campaign's claims lies.

Clinton’s campaign has accepted sums from fossil fuel companies. According to a Huffington Post report from July of last year, most of her campaign’s largest bundlers at the time were lobbyists for the industry.

In a statement, Greenpeace Director Molly Dorozenski said: "Secretary Clinton is conflating Greenpeace with the Sanders campaign, but we are an independent organization, and our research team has assessed the contributions to all Presidential candidates. We have not and will not endorse candidates."