The letter, issued Thursday, says the decision to use nuclear weapons requires “composure, judgment, restraint and diplomatic skill” — all qualities that the former Air Force officers who signed it said Trump lacks.

“On the contrary, he has shown himself time and again to be easily baited and quick to lash out, dismissive of expert consultation and ill-informed of even basic military and international affairs — including, most especially, nuclear weapons,” the letter says. “Donald Trump should not be the nation’s commander-in-chief. He should not be entrusted with the nuclear launch codes. He should not have his finger on the button.”

[Read the full letter here]

The letter is the latest in an extraordinary series of missives signed this year by diplomats and national security experts warning of the dangers they think a Trump presidency would pose. Last month, in a break from the trend, 88 retired military leaders endorsed the Republican presidential nominee. But most of the letters have reflected the views of those who consider Trump unfit to be commander in chief.

If a president orders a missile launch, Blair said, five crews are equipped with keys used to fire a total of 50 missiles. Although the keys are interconnected, the missiles can be launched if just two crews carry out the order.

“Only the president can order a nuclear launch,” the letter states. “That order cannot be vetoed and once the missiles have been launched, they cannot be called back. The consequences of miscalculation, impulsive decision-making or poor judgment on the part of the president could be catastrophic.”

“The presumption is, the commander in chief is acting in the national interest, and his decision should be grounded in knowledge and good advice,” he said. “Everyone would have to assume that, even though they had doubts — very strong doubts, if Trump were president.” https://www.washingtonpost.com/world/national-security/10-former-nuclear-launch-officers-sign-letter-trump-should-not-have-his-finger-on-the-button/2016/10/13/eef68fde-2468-4305-84d4-86033df53b3f_story.html