Donald Trump says he expects to be arrested on Tuesday and has urged his supporters to launch mass protests.
However his lawyer said there had been no communication from law enforcement and the former president's post was based on media reports.
Prosecutors have been looking at a possible indictment of Mr Trump. Reports say it could come next week.
If he is indicted, it would be the first criminal case ever brought against a former US president.
This case focuses on alleged hush money paid on Mr Trump's behalf by his lawyer to porn star Stormy Daniels prior to the 2016 presidential election.
It is one of several cases in which the 76-year-old is currently being investigated, although he has not yet been charged in any and denies wrongdoing in each.
Mr Trump has pledged to continue his campaign to become the Republican nominee in the 2024 presidential election, even if he is indicted.
Past efforts to investigate him, including two impeachment trials, the Russia investigation and the Mar-a-Lago raid, have tended to make him more popular with his base, so an indictment could have a similar effect.
It is not yet known if he is going to be criminally charged this week or even, beyond broad strokes, what those charges might be.
But with the former president predicting an arrest, and calling for mass protests, this is a journey into unknown territory.
Mr Trump has a loyal base of followers, and the 6 January 2021 attack on the US Capitol by his supporters following his repeated calls to protest has proven that a fraught situation can quickly escalate into violence.
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