The worst thing one of Mary Jordan’s claimed 100 sources had to say about Melania Trump is that she’s 'stubborn.' No arguments there. There are no major bombshells in Mary Jordan’s new biography of Melania Trump, “The Art of Her Deal.” Jordan merely reaffirms what we’ve always known about the First Lady—she’s a cool head in an unsteady world, and the ultimate poster girl for soft power. The worst thing one of Jordan’s 100 sources had to say about Trump is that she’s “stubborn.” No arguments there. Like an alabaster Greek statue, Melania stays strong and unflappably elegant as her...