Donald Trump claimed on Saturday that his arrest is imminent and issued an extraordinary call for his supporters to protest as a New York grand jury investigates hush money payments to women who alleged sexual encounters with the former president.

Even as Trump’s lawyer and spokesperson said there had been no communication from prosecutors, Trump declared in a post on his social media platform that he expects to be taken into custody on Tuesday.

His message seemed designed to preempt a formal announcement from prosecutors and to galvanize outrage from his base of supporters in advance of widely anticipated charges. Within hours, his campaign was sending fundraising solicitations to his supporters, while influential Republicans in Congress and even some declared and potential rival candidates issued statements in his defense.

In a later post that went beyond simply exhorting loyalists to protest about his legal peril, the 2024 presidential candidate directed his overarching ire in all capital letters at the Biden administration and raised the prospect of civil unrest: “IT’S TIME!!!” he wrote. “WE JUST CAN’T ALLOW THIS ANYMORE. THEY’RE KILLING OUR NATION AS WE SIT BACK & WATCH. WE MUST SAVE AMERICA!PROTEST, PROTEST, PROTEST!!!

It all evoked, in foreboding ways, the rhetoric he used shortly before the insurrection at the U.S. Capitol on Jan. 6, 2021. After hearing from the then–president at a Washington rally that morning, his supporters marched to the Capitol and tried to stop the congressional certification of Democrat Joe Biden’s White House victory, breaking through doors and windows of the building and leaving officers beaten and bloodied.

District Attorney Alvin Bragg is thought to be eyeing charges in the hush money investigation, and recently offered Trump a chance to testify before the grand jury. Local law enforcement officials are bracing for the public safety ramifications of an unprecedented prosecution of a former American president.

In an internal email following Trump’s statements, Bragg said law enforcement would ensure that the 1,600 people who work in his office would remain safe, and that “any specific or credible threats” would be investigated.