Icahn said in a letter to Trump released on Friday that he would resign to prevent "partisan bickering" about his role that Democrats suggested could benefit him financially.
The New Yorker was scheduled to post its story online and begin selling printed magazines on Monday. The story points out potential conflicts and even possible criminal law violations involving obscure rules that require oil refineries to blend ethanol into gasoline.
In his letter, Icahn wrote that he never had access to non-public information or profited from his position.
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