Mary Trump, the niece of President Donald Trump, is slated to publish a tell all book over the summebr Mary Trump, the niece of President Donald Trump, is slated to publish a tell all book over the summebr Mary Trump, the niece of President Donald Trump, is slated to publish a tell all book over the summebr Mary Trump, the niece of President Donald Trump, is slated to publish a tell all book over the summebr Mary Trump, the niece of President Donald Trump, is slated to publish a tell all book over the summe