An old rule in Washington holds that you are entitled to your own opinions but you are not entitled to your own facts. President Trump seems determined to prove that wrong.....

The message, however, was unmistakable: Government officials who deal in data now fear they have to toe the line or risk losing their jobs. Career scientists, longtime intelligence analysts and nonpartisan statisticians who serve every president regardless of political party with neutral information on countless matters, such as weather patterns and vaccine efficacy, now face pressure as never before to conform to the alternative reality enforced by the president and his team.

Mr. Trump has never been especially wedded to facts, routinely making up his own numbers, repeating falsehoods and conspiracy theories even after they are debunked and denigrating the very concept of independent fact-checking. But his efforts since reclaiming the White House to make the rest of government adopt his versions of the truth have gone further than in his first term and increasingly remind scholars of the way authoritarian leaders in other countries have sought to control information.

“Democracy can’t realistically exist without reliable epistemic infrastructure,” said Michael Patrick Lynch, author of the recently published “On Truth in Politics” and a professor at the University of Connecticut.

“Anti-democratic, authoritarian leaders know this,” he said. “That is why they will seize every opportunity to control sources of information. As Bacon taught us, knowledge is power. But preventing or controlling access to knowledge is also power.”....

“It’s a post-factual world that Trump is looking for, and he’s got these sycophants working for him that don’t challenge him on facts,” said Barbara Comstock, a former Republican congresswoman from Virginia.

But firing the messenger, she said, will not make the economy any better. “The reality is the economy is worse, and he can’t keep saying it’s better,” she said. “Joe Biden learned that; people still experience the experience they have, no matter how much” you tell them otherwise.