According to TASS, citing data from the Business Insider portal, Trump's team sent out a letter to 74 million supporters of the politician asking them to respond to the call.
"They are trying to intimidate you and annul your voice," the publication quotes the text of the message.
On March 21, Trump supporters went to court in New York, where the politician could face charges.
Earlier, Trump said that he expects his detention on Tuesday, March 21, and called on his supporters to protest. The politician also criticized the Manhattan District Attorney's Office.
A CNN source in Trump's inner circle said the former president privately told him about the possibility of charges only on the grounds that Manhattan District Attorney Alvin Bragg "hates him."