Ivanka Trump finally broke her silence about rumors that she might fill the role of first lady when her father takes office on Friday in an interview with Good Morning America. 'Well, I think its an inappropriate observation. There's one first lady and she'll do remarkable things,' said Ivanka, referring to her father's wife Melania. She later told Deborah Roberts in the interview, which will air in full on 20/20 Thursday night, that she also found the comments 'sexist,' saying that they seemed to suggest that two women could not have a powerful role in her father's White House administration....