On Monday, 50 Republicans signed a letter denouncing the party’s presidential nominee, Donald Trump, as a “risk” to America’s “national security and well-being.” These aren’t any ordinary Republicans. They are some of the party’s leading national security and foreign policy voices, people like Michael Chertoff and Tom Ridge, who both served as secretary of homeland security under former President George W. Bush; Michael Hayden, who previously headed both the CIA and National Security Agency; Eric Edelman, who worked for former Vice President Dick Cheney; and Richard Fontaine, who was a foreign policy adviser to Sen. John McCain. They were merciless […]