President Trump undercut his attorney, Rudolph W. Giuliani, on Friday, and said the former New York mayor will eventually get the facts right regarding a payment to a pornographic actress who said she had an affair with Mr. Trump.

Everything “has been said incorrectly,” Mr. Trump said, blaming the media coverage and Mr. Giuliani’s short time on the job.

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“It’s actually very simple,” the president said, without elaboration.