Hillary ClintonHillary Diane Rodham ClintonTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada MORE on Thursday accused Bernie SandersBernard (Bernie) SandersTrump's trade war — firing all cannons or closing the portholes? The Hill's 12:30 Report — Trump rips 'ridiculous' spending bill | FBI dragged into new fight | Latest on Maryland shooting Poll: Most Massachusetts voters don't think Warren should run for president in 2020 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."