Former vice president Dick Cheney, in a campaign ad for his eldest daughter, Rep. Liz Cheney (R-Wyo.), said former president Donald Trump is a “coward” and the greatest threat to the nation in its 246-year history. “He is a coward,” Cheney says in the ad, which was released Thursday. “A real man wouldn’t lie to his supporters. He lost his election, and he lost big. I know it, he knows it, and deep down I think most Republicans know it.” Liz Cheney faces a tough primary on Aug. 16 for Wyoming’s sole congressional seat, with Trump-backed Harriet Hageman favored to...