Read previewInvestor Whitney Tilson, a longtime donor to President Joe Biden, says he's reconsidering his support for Biden after his stumbling performance at last week's presidential debate. The former hedge fund manager said Biden must withdraw from the presidential race if his bad performance on Thursday's debate was not a one-off. "If it's as bad as what we all witnessed on Thursday night, then he needs to put his country first and step aside immediately," Tilson wrote. AdvertisementRepresentatives for Biden and Tilson did not immediately respond to requests for comment from BI sent outside regular business hours. Biden's performance on Thursday was riddled with gaffes and stumbles as he sought to make the case for his candidacy against his GOP rival, Trump.

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