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Becky Morton
Political reporter
Reuters
"As I said just last week, he was a huge factor in our success on May 1st and is an enormously talented person," Farage wrote on social media.
"Politics can be a highly pressured and difficult game and Zia has clearly had enough. He is a loss to us and public life."
In a post on X, Yusuf wrote: "11 months ago I became chairman of Reform. I've worked full time as a volunteer to take the party from 14 to 30% [in national polls], quadrupled its membership and delivered historic electoral results.
"I no longer believe working to get a Reform government elected is a good use of my time, and hereby resign the office."