Donald Trump's eldest sister, Maryanne Trump Barry, has publicly criticized himDonald Trump's eldest sister, Maryanne Trump Barry, publicly criticized him when he became president. In secret recordings, she can be heard telling his niece, Mary Trump, that her brother "has no principles" and people "can't trust him". Mary Trump, who has a long-standing feud with her uncle, recently published a tell-all book making several claims about him. Here are some standout quotes from the recordings:Mary Trump, that her brother "has no principles""He has no principles." While discussing the ongoing conflict with her brother since the 1980s, Barry told her niece this, according to the Post.