Earlier this week, fifty Republican national-security experts released an extraordinary public letter condemning their party’s Presidential nominee, Donald Trump. “From a foreign policy perspective,” they wrote, “Donald Trump is not qualified to be President and Commander-in-Chief.” Michael Chertoff, the former Homeland Security Secretary and one of the signers of the letter, joins The New Yorker’s Evan Osnos to discuss the split within the national-security community, his view of Hillary Clinton, and his warnings against the risks of a Trump Presidency.
