The New York Times.
IS there any scarier nightmare than President Donald J. Trump in a tense international crisis, indignant and impatient, with his sweaty finger on the nuclear trigger?

“Trump is a danger to our national security,” John B. Bellinger III, legal adviser to the State Department under President George W. Bush, bluntly warned.

Most of the discussion about Trump focuses on domestic policy. But checks and balances mean that there are limits to what a president can achieve domestically, while the Constitution gives a commander in chief a much freer hand abroad.

That’s what horrifies America-watchers overseas. Der Spiegel, the German magazine, has called Trump the most dangerous man in the world. Even the leader of a Swedish nationalist party that started as a neo-Nazi white supremacist group has disavowed Trump. J. K. Rowling, author of the Harry Potter books, reflected the views of many Britons when she tweeted that Trump is worse than Voldemort.

Leading American conservative thinkers on foreign policy issued an open letter a few days ago warning that they could not support Trump. The signatories include Michael Chertoff, the former secretary of homeland security, Robert Zoellick, the former deputy secretary of state, and more than 100 others.

“Mr. Trump’s own statements lead us to conclude that as president, he would use the authority of his office to act in ways that make America less safe,” the letter declared.

A starting point is Trump’s remarkable ignorance about international affairs. And every time he tries to reassure, he digs the hole deeper. Asked in the latest debate to name people whose foreign policy ideas he respects, Trump offered Gen. Jack Keane, and mispronounced his name.

Asked about Syria, Trump said last year that he would unleash ISIS to destroy Syria’s government. That is insane: ISIS is already murdering or enslaving Christians, Yazidis and other religious minorities; executing gays; destroying antiquities; oppressing women. And Trump wants ISIS to capture Damascus?

A second major concern is that Trump would start a trade war, or a real war. Trump told The New York Times in January that he favored a 45 percent tariff on Chinese goods, then denied ever having said such a thing. The Times produced the audio (that part of the conversation was on the record) in which Trump clearly backed the 45 percent tariff, risking a trade war between the world’s two largest economies.

Trump has also called for more U.S. troops on the ground in Iraq, and raised the prospect of bombing North Korean nuclear sites. A poorly informed, impatient and pugnacious leader can cause devastation, and that’s true of either Kim Jong-un or Donald Trump.

The third risk is to America’s reputation and soft power. Both Bush and President Obama worked hard to reassure the world’s 1.6 billion Muslims that the U.S. is not at war with Islam. Trump has pretty much declared war on all Muslims.

The damage to America’s image is already done, even if Trump is never elected. Simply as a blowhard who gains headlines around the world, he reinforces caricatures of the United States and tarnishes our global reputation. He turns America into an object of derision. He is America’s Ahmadinejad.

On Twitter, I suggested that Trump was pugnacious, pugilistic, preening and puerile, and asked for other P words to describe him. The result was a deluge: petulant, pandering, pathetic, peevish, prickly, pernicious, patronizing, Pantagruelian, prevaricating, phony, presumptuous, potty-mouthed, provocative, pompous, predatory and so many more, including the troubling “probably president.”

There’s something heartbreaking about the prospect that America’s next commander in chief may be a global joke, a man regarded in most foreign capitals as a buffoon, and a dangerous one.

Trump is not particularly ideological, and it’s possible that as president he would surround himself with experts and would back off extreme positions. It was a good sign that on Friday he appeared to reverse himself and pledged that he would not order the U.S. military to commit war crimes, yet that’s such an astonishingly low bar that I can’t believe I just wrote this sentence!

In any case, Trump is nothing if not unpredictable, and it seems equally plausible that he would start new wars. It’s a risk that few sensible people want to take. As Mitt Romney notes, “This is the very brand of anger that has led other nations into the abyss.”

Peter Feaver, a Duke University political scientist who was a national security official in the Bush White House, noted that most Republicans are united in believing that President Obama and Hillary Clinton have damaged the United States and added to the burdens of the next president.

“Yet what Trump promises to do would in some important ways make all of the problems we face dramatically worse,” he told me. “Why, at a moment when the country desperately needs our A-team, would we send in the clowns?”