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Atkinson also said the whistleblower showed potential signs of political bias. Despite that, he said the law did not require him to dismiss the complaint on that basis.
Democrats argued the request amounted to a quid pro quo tied to U.S. military aid. Trump and his allies rejected that characterization and said the call was appropriate.
Biden has said his actions regarding Ukraine were part of official U.S. policy at the time. He described pressuring Ukraine to remove a prosecutor during a 2018 event.