Only 22 percent of UK residents back Corbyn's candidature for the post of prime minister, while 36 percent support current head of the government Theresa May, the YouGov survey showed.
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A week ago, 32 percent supported May, while 25 thought Corbyn would make the best prime minister.
The popularity slump comes amid persistent allegations of anti-Semitism within the Labour party.
The survey was carried out on August 8-9 among 1,675 adults.