Melania and Ivanka Trump’s united front may have just been a facade. In Katie Rogers’ upcoming book American Woman: The Transformation of the Modern First Lady, from Hillary Clinton to Jill Biden, the author claimed that the ladies endured an “internal power struggle” during Donald Trump’s four years in office. According to Rogers, their tiff flared up at the beginning of Donald’s presidency, as Melania, 53, stayed put in NYC for the sake of their son Barron’s education. Since Melania’s office was empty, Ivanka wanted to turn it into an area “geared to serving the entire First Family, not just…