"It is called the illusory truth effect. Basically, this means that people are more likely to believe a statement is true simply because they've heard it or read it multiple times, even if initially they know it is false.

And Trump excels at this.

And I know that's kind of a strange thing to say that Trump excels at repeating the lies that he
wants people to believe, but he really does.

He will say things and then keep on saying them so many times that eventually people believe him. And more and more people on the right beginning to think that Donald Trump is this great truth teller even though he had a history being deceptive going back 40 years before even entering politics.

In fact, there was a poll back in 2023 that showed that Trump voters actually trust him more than they do their own families or religious leaders."

excerpt, vid and transcript at the link