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President Donald Trump gives the thumbs-up as he walks to board Marine One on the South Lawn of the White House in Washington, Tuesday, April 18, 2017, for the short trip to Andrews Air Force Base, Md., en route to Snap-On Tools in Kenosha, Wis. (AP Photo/Carolyn Kaster) Image Credit: AP

In times of crisis, credibility is an American president’s most valuable currency. It’s one thing for a foreign partner to doubt a president’s judgement; it’s entirely more debilitating when that partner doubts the president’s word. As President Donald Trump confronts the twin challenges of North Korea and Syria, he must overcome a credibility gap of his own making. His insistence on remaining the most prominent consumer and purveyor of fake news and conspiracy theories is not only corrosive of our democracy — but also dangerous to our national security. Every fact-averse tweet devalues his credibility at home and around the world. This matters more than ever when misinformation is a weapon of choice for our most dangerous adversaries.

Part of the problem is that Trump’s itchy Twitter finger can’t resist bluster. A series of sophomoric presidential missives has given Pyongyang a rare chance to take the high road. “Trump is always making provocations with his aggressive words,” its vice-foreign minister declared.

Presidential bravado also risks North Korea taking him at his word and miscalculating accordingly. Loose threats of pre-emptive military strikes could cause its leader, Kim Jong-un, to shoot first and worry about the consequences later — perhaps striking South Korea with conventional weapons to remind the world what he is capable of, if the United States seeks to eliminate his nuclear programme. That’s a quick path to conflict with a volatile and nuclear-armed adversary.

Equally problematic is Trump’s challenged relationship with veracity, documented almost daily by independent fact-checking organisations. The greatest hits include his repeatedly debunked claim that former President Barack Obama tapped his phones, that a nonexistent terrorist attack occurred in Sweden, that Germany owes Nato vast sums of money, that Obama released more than 100 detainees from Guantanamo who returned to the battlefield and that Democrats made up allegations about Russian efforts to influence our election. Trump’s canards risk undermining his ability to counter propaganda from our adversaries.

The president was rightly applauded for striking back smartly against the Al Assad regime in Syria for its use of chemical weapons. But that strike incited an information war in which President Bashar Al Assad and his Russian enablers have sought to escape blame for the atrocity. Their tactics have ranged from advancing alternative scenarios — for example, alleging that it was American warplanes that bombed a terrorist warehouse full of sarin gas — to asserting that the evidence proffered by the United States was fabricated. Putin is a master at this game, throwing out falsehoods to confuse casual consumers of the news while creating a false equivalence between western governments and media, and his own.

During the crisis caused by Russia’s military aggression against Ukraine in 2014, I worked with colleagues in the Obama administration to convince people in other countries that Russian troops were indeed in the eastern Ukrainian region of Donbass, that Moscow was arming and directing the separatists, and that it was the separatists, using a missile launcher driven in from Russia, who had shot down a Malaysian passenger airliner, killing all onboard. We spent hours negotiating with the intelligence community about what information we could declassify, marshalling open-source evidence and working on fact-based presentations for our allies and the media.

Putin’s propaganda campaigns made our job tougher than expected. But we had one trump card that usually carried the day: Obama’s credibility. Foreign leaders trusted his word, even when they disagreed with his policies.

President John F. Kennedy demonstrated the value of presidential credibility at the height of the Cuban missile crisis, in October 1962, when he sent emissaries to America’s allies to secure support for the quarantine of Cuba. He designated former Secretary of State Dean Acheson to deal with Washington’s prickliest partner — President Charles de Gaulle of France. When Acheson offered to show de Gaulle spy-plane imagery to back the claim that the Soviet Union had deployed nuclear missiles 90 miles from American shores, de Gaulle threw up his hands and said he needed no such evidence. “The word of the president of the United States is good enough for me,” he said.

If Trump continues to spread his own misinformation on matters large and small, he will cede that advantage and America will be seen like any other country — which is just what our adversaries want. This will complicate his administration’s ability to rally other countries against threats to our national security.

Every country has a founding mythology. For Americans it starts with our first president’s youthful encounter with a cherry tree and refusal to tell a lie. Trump would do well to find inspiration in that story, which goes to the heart of what makes America different — and our foreign policy effective — around the world.

— New York Times News Service

Antony J. Blinken, a deputy secretary of state in the Obama administration, is a contributing opinion writer for the New York Times