According to those who have worked closely with former Secretary of State Hillary Clinton, her temper is legendary.

Usually, her tantrums are reserved for closed-door and behind-the-scenes berating. But this week, she lost her composure with an environmental activist who questioned her about past donations from oil companies, a claim made by her challenger for the Democratic Party's presidential nomination, U.S. Sen. Bernie Sanders (D-Vt.).

See the exchange below. It is one the Clinton campaign probably wishes they could make disappear.

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