For much of his political career, dishonesty has been without cost for Donald Trump. He entered into national politics with the birther lie, claiming that Barack Obama was not born in the U.S., and that did not prevent Trump from winning the 2016 GOP nomination.

His persistent false statements about crowd sizes, electoral outcomes and the birthplace of his father barely garner press coverage today.

What’s more, the admission that Trump lies seems to have had little impact. On the campaign trail during the 2024 presidential race, vice-presidential candidate JD Vance acknowledged that Trump’s story that Haitian immigrants were eating pets in Ohio had been “created.” That confession had no discernible effect on Trump’s popularity. In fact, some measures indicate that Trump’s supporters admire his untruthfulness.

More recently, however, things have changed. Data now indicates mounting regret and disappointment among his base.

The administration’s failure to sustain convincing messaging about the Iran war, the Epstein files, the tariffs and inflation have left some supporters feeling duped and abandoned by Trump.

The president’s recent approval numbers are registering this shift.

This might suggest that fact-checking efforts are paying off. But, as a philosopher who studies the cognitive and emotional aspects of citizenship, I think this is incorrect. There is a better explanation for why, at this point, Trump’s followers are reacting negatively to his assertions.

Although fact-checking can be successful in establishing the facts among people who have not already made up their minds, it is generally ineffective among true believers. Once someone has formed an opinion, debunking their belief can backfire, driving them to commit even more strongly to their mistake.

To explain the emerging shift among Trump’s base requires looking elsewhere. Specifically, I think it requires abandoning the idea that Trump’s more outlandishly false statements are lies at all.

I realize that this may sound odd.

To explain, let’s begin by noting that it is surprisingly difficult to give an adequate definition of lying. Intuitive characterizations – “A lie is something that isn’t true” – fall short.

For example, lying isn’t merely uttering a falsehood. Honest mistakes and statements made from lapses of memory are not lies. You could say instead that lying is deliberately asserting what one knows to be false.

But that won’t work, either.

President Bill Clinton lied when he claimed that “there is not a sexual relationship,” which, at the moment he said it, was true.

At the very least, the definition of lying must include speaking with the aim of causing one’s audience to adopt a falsehood. But that would make stage actors liars.

We should say instead that lying is a matter of speaking with the intent to deceive. Though difficulties remain, that’s a workable definition.

Given the ease with which many of Trump’s false statements are debunked, I think it’s unlikely that he aims to deceive anyone. No one really believes that Trump has stopped eight wars, defeated inflation, brought gasoline prices below US$2, cut a deal with the CEO of Sharpie or has 100% approval for his military incursion in Iran – all things he has said.

As he is not attempting to deceive, Trump isn’t lying when he makes such claims. Rather, he is doing something else entirely, something arguably more pernicious.

From my perspective as a political philosopher, these and other similar claims indicate he is speaking falsely as a way of demeaning or taunting his detractors. By resolutely asserting unbelievable falsehoods, Trump is expressing contempt. He is deriding the enterprise of journalism, in effect forcing reporters to write stories about his incredible statements, thereby indirectly controlling the news cycle.

It seems to me that his purpose is not to convince anyone, but rather to declare to the press, and perhaps also to his opposition, “You cannot stop me.” For a political movement rooted in the idea that U.S. politics is a swamp in need of draining, Trump’s defiant style has been successful.

But here’s the catch. It appears that Trump’s supporters are now beginning to feel that they, too, are on the receiving end of his contempt.

His recent claims that grocery prices are falling, his tariffs are working, the economy is roaring and the operation in Iran is a “little excursion” that has already been successful are not only obvious falsehoods.

In asserting them, Trump belittles those who must bear the effects of a struggling economy and an ill-conceived war. From this perspective, the shift among his base is not due to their realization that Trump lies. It’s that he has betrayed them.

This article is republished from The Conversation, a nonprofit, independent news organization bringing you facts and trustworthy analysis to help you make sense of our complex world. It was written by: Robert B. Talisse, Vanderbilt University

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Robert B. Talisse does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.