But amid all those lies, told to ourselves and to one another in order to amass power, woo lovers, hurt enemies and shield ourselves against the often glaring discomfort of reality, humanity has always had an abiding respect for truth.

In the United States, born and periodically reborn out of the repeated recognition and rejection of the age-old lie that some people are meant to take dominion over others, truth is as vital a part of the civic, social and intellectual culture as justice and liberty. Our civilization is premised on the conviction that such a thing as truth exists, that it is knowable, that it is verifiable, that it exists independently of authority or popularity and that at some point — and preferably sooner rather than later — it will prevail.

Even American leaders who lie generally know the difference between their statements and the truth. Richard Nixon said “I am not a crook” but by that point must have seen that he was. Bill Clinton said “I did not have sexual relations with that woman” but knew that he did.

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He targets the darkness, anger and insecurity that hide in each of us and harnesses them for his own purposes.
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The insult that Donald Trump brings to the equation is an apparent disregard for fact so profound as to suggest that he may not see much practical distinction between lies, if he believes they serve him, and the truth.

His approach succeeds because of his preternaturally deft grasp of his audience. Though he is neither terribly articulate nor a seasoned politician, he has a remarkable instinct for discerning which conspiracy theories in which quasi-news source, or which of his own inner musings, will turn into ratings gold. He targets the darkness, anger and insecurity that hide in each of us and harnesses them for his own purposes. If one of his lies doesn’t work — well, then he lies about that.

If we harbor latent racism or if we fear terror attacks by Muslim extremists, then he elevates a rumor into a public debate: Was Barack Obama born in Kenya, and is he therefore not really president?

An ‘extremely credible source’ has called my office and told me that @BarackObama’s birth certificate is a fraud.

— Donald J. Trump (@realDonaldTrump) August 6, 2012
Libya is being taken over by Islamic radicals—-with @BarackObama’s open support.

— Donald J. Trump (@realDonaldTrump) August 31, 2011
If his own ego is threatened — if broadcast footage and photos show a smaller-sized crowd at his inauguration than he wanted — then he targets the news media, falsely charging outlets with disseminating “fake news” and insisting, against all evidence, that he has proved his case (“We caught them in a beauty,” he said).

If his attempt to limit the number of Muslim visitors to the U.S. degenerates into an absolute fiasco and a display of his administration’s incompetence, then he falsely asserts that terrorist attacks are underreported. (One case in point offered by the White House was the 2015 attack in San Bernardino, which in fact received intensive worldwide news coverage. The Los Angeles Times won a Pulitzer Prize for its reporting on the subject).

If he detects that his audience may be wearying of his act, or if he worries about a probe into Russian meddling into the election that put him in office, he tweets in the middle of the night the astonishingly absurd claim that President Obama tapped his phones. And when evidence fails to support him he dispatches his aides to explain that by “phone tapping” he obviously didn’t mean phone tapping. Instead of backing down when confronted with reality, he insists that his rebutted assertions will be vindicated as true at some point in the future.

Trump’s easy embrace of untruth can sometimes be entertaining, in the vein of a Moammar Kadafi speech to the United Nations or the self-serving blathering of a 6-year-old.

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He gives every indication that he is as much the gullible tool of liars as he is the liar in chief.
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But he is not merely amusing. He is dangerous. His choice of falsehoods and his method of spewing them — often in tweets, as if he spent his days and nights glued to his bedside radio and was periodically set off by some drivel uttered by a talk show host who repeated something he’d read on some fringe blog — are a clue to Trump’s thought processes and perhaps his lack of agency. He gives every indication that he is as much the gullible tool of liars as he is the liar in chief.

He has made himself the stooge, the mark, for every crazy blogger, political quack, racial theorist, foreign leader or nutcase peddling a story that he might repackage to his benefit as a tweet, an appointment, an executive order or a policy. He is a stranger to the concept of verification, the insistence on evidence and the standards of proof that apply in a courtroom or a medical lab — and that ought to prevail in the White House.

There have always been those who accept the intellectually bankrupt notion that people are entitled to invent their own facts — consider the “9/11 was an inside job” trope — but Trump’s ascent marks the first time that the culture of alternative reality has made its home at 1600 Pennsylvania Ave.

If Americans are unsure which Trump they have — the Machiavellian negotiator who lies to manipulate simpler minds, or one of those simpler minds himself — does it really matter? In either case he puts the nation in danger by undermining the role of truth in public discourse and policymaking, as well as the notion of truth being verifiable and mutually intelligible.

In the months ahead, Trump will bring his embrace of alternative facts on the nation’s behalf into talks with China, North Korea or any number of powers with interests counter to ours and that constitute an existential threat. At home, Trump now becomes the embodiment of the populist notion (with roots planted at least as deeply in the Left as the Right) that verifiable truth is merely a concept invented by fusty intellectuals, and that popular leaders can provide some equally valid substitute. We’ve seen people like that before, and we have a name for them: demagogues.

Our civilization is defined in part by the disciplines — science, law, journalism — that have developed systematic methods to arrive at the truth. Citizenship brings with it the obligation to engage in a similar process. Good citizens test assumptions, question leaders, argue details, research claims.

Investigate. Read. Write. Listen. Speak. Think. Be wary of those who disparage the investigators, the readers, the writers, the listeners, the speakers and the thinkers. Be suspicious of those who confuse reality with reality TV, and those who repeat falsehoods while insisting, against all evidence, that they are true. To defend freedom, demand fact.