Sure sign that he is nervous about the various ongoing civil and criminal investigations being conducted by the DOJ as well as GA, and NY. With Trump, its always all about him. Its also not new. He has used civil strife language and signals for call to action before.
For example:
“These prosecutors are vicious, horrible people. They’re racists and they’re very sick, they’re mentally sick,” They’re going after me without any protection of my rights from the Supreme Court or most other courts. In reality, they’re not after me, they’re after you. If these radical, vicious, racist prosecutors do anything wrong or illegal, I hope we are going to have in this country the biggest protest we have ever had in Washington, D.C, in New York, in Atlanta and elsewhere,”
--Trump at a Texas rally, January 29, 2022
The vitriol he will spew when the J6 Committee lays out the evidence will likely exceed anything he has vomited before.