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.

Don’t like an intelligence report that contradicts your view? Go after the analysts. Don’t like cost estimates for your tax plan? Invent your own. Don’t like a predecessor’s climate policies? Scrub government websites of underlying data. Don’t like a museum exhibit that cites your impeachments? Delete any mention of them.

Mr. Trump’s war on facts reached new heights on Friday when he angrily fired the Labor Department official in charge of compiling statistics on employment in America because he did not like the latest jobs report showing that the economy isn’t doing as well as he claims it is. Mr. Trump declared that her numbers were “phony.” His proof? It was “my opinion.” And the story he told supposedly proving she was politically biased? It had no basis in fact itself.

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.