In her first briefing as White House press secretary, Karoline Leavitt said she was “committed to telling the truth from this podium every single day.” Moments later she announced that the new administration had blocked a $50 million contract for condoms in Gaza.

“That is a preposterous waste of taxpayer money,” she said.

It was also a preposterous claim, improbable on its face and quickly debunked. There were millions in federal grants awarded to prevent sexually transmitted diseases in Gaza, but in the province in Mozambique, not the Palestinian territory.

The condoms claim went viral anyway, seeping into the political discourse that President Trump has used to justify his sweeping push to slash the federal government.

Mr. Trump’s first four years in the White House were filled with false or misleading statements — 30,573 of them, or 21 a day on average, according to one tally. Back then, though, aides often tried to play down or contain the damage of egregious falsehoods.

This time, Mr. Trump is joined by a coterie of cabinet officials and advisers who have amplified them and even spread their own. Together, they are effectively institutionalizing disinformation.

While it is still early in his term, and many of his executive orders face legal challenges that could blunt the impact of any falsehoods driving them, Mr. Trump and his advisers have ushered the country into a new era of post-truth politics, where facts are contested and fictions used to pursue policy goals.

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