How did Margot Robbie approach Tonya Harding's story?

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Tonya Harding became perhaps the most infamous figure skater in the world when she was banned from skating after an attack on her rival Nancy Kerrigan. But it's her own background of domestic violence and snobbery that takes centre stage in Margot Robbie's new film I, Tonya. Jane Garvey asks Margot how she approached such a sensitive subject.