"I also listened to hours and hours and hours and hours and hours of [J.F.] Kennedy, and I sort of built [ accent]. And then I got on set [of 'J.F.Kennedy' movie ] and forgot it.But that's what you want to do. You want it to just be real. And I think authenticity was better than - people always talk about when an accent doesn't work, and the phrase you always hear is, "It was inconsistent.""