Barricades have been erected outside a New York courthouse as the city braces for the possibility that Donald Trump could be arrested and charged over alleged hush money payments to porn star Stormy Daniels during the 2016 presidential campaign.
It would be the first criminal case brought against a former US president.
Saturday, Mr Trump Followers on social media were urged to protest what he said was an imminent arrest.
That raised concerns about a repeat of the violence he saw on Capitol Hill after his defeat in the 2020 presidential election.
New York Mayor Eric Adams told reporters that police were monitoring social media and keeping an eye out for “misconduct” in the city.
The NYPD said there were no known credible threats.
However, barricades have been erected outside Trump Tower and Manhattan Criminal Court to prevent crowds and any trouble after the ex-president claims his imminent arrest.
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If charged, Mr. Trump may have to travel from his home in Florida for fingerprinting and other processing.
Law enforcement officials met Monday to discuss logistics, according to multiple media reports.
Mr. Trump’s attorney, Joseph Tacopina, told The Associated Press that if the former president is indicted, “we will follow the normal process.”
The grand jury, which heard further testimony on Monday, could bring charges as soon as this week.
Mr. Trump, who is seeking the Republican nomination for the White House again in 2024, had predicted he would be arrested on Tuesday.
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On Monday, the grand jury heard testimony from witness attorney Robert Costello. Mr. Trump’s former lawyer, Michael Cohen, handled the hush money without Mr. Trump’s involvement, he said.
“Michael Cohen decides for himself – and that’s what he told us – for himself, to see if he can work this out,” Mr Costello told reporters after testifying at the behest of Mr Trump’s legal team.
Mr. Cohen, who has twice testified before a grand jury, said publicly that Mr. Trump directed him to make the payments on his behalf.
The investigation by Manhattan District Attorney Alvin Bragg is one of several legal challenges Mr. Trump is facing, including a Jan. 6, 2021, legal action, capitol riots.
Mr. Bragg’s office has apparently been examining whether any state laws related to the payments were violated, or the way Mr. Trump’s company compensated Mr. Cohen to keep the women’s allegations quiet.
Mr. Cohen pleaded guilty in 2018 to federal campaign finance irregularities related to his arrangement of payments ms danielswhose legal name is Stephanie Clifford and another woman, in exchange for keeping quiet about their alleged affair with Mr Trump.
Mr. Trump has denied any wrongdoing or that any such incident occurred.
Some 44 percent of Republicans said Trump should drop out of the presidential race if he is indicted, according to a seven-day Reuters/Ipsos poll that ended on Monday.