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b'Over the weekend, reports of a secret whistle-blower complaint against President Trump turned into allegations that the president had courted foreign interference from Ukraine to hurt a leading Democratic rival, former Vice President Joseph R. Biden Jr. Mr. Trump called the allegations a \\u201cwitch hunt\\u201d and accused Mr. Biden of corruption.\\n\\nGuest: Michael S. Schmidt, who covers national security and federal investigations for The New York Times. For more information on today\\u2019s episode, visit nytimes.com/thedaily.\\xa0\\n\\nBackground reading:\\xa0President Trump acknowledged that he discussed Mr. Biden during a phone call with Ukraine\\u2019s president, but he did not directly confirm news reports that he had pressured the foreign leader for an investigation.Here\\u2019s what we know about the role of Mr. Biden and his son Hunter in the controversy.'