Hillary ClintonHillary Diane Rodham ClintonBiden flexes presidential muscle on campaign trail with Virginia's McAuliffe Shontel Brown gaining ground against Nina Turner in Ohio: poll Biden hits trail for McAuliffe in test of his political brand MORE on Thursday accused Bernie SandersBernie SandersPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Overnight Defense: US launches another airstrike in Somalia | Amendment to expand Pentagon recusal period added to NDAA | No. 2 State Dept. official to lead nuclear talks with Russia US launches second Somalia strike in week 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."