The potential indictment stems from the lengthy investigation surrounding Trump's alleged payment of "hush money" to actress Stormy Daniels.
Toward the end of the 2016 presidential campaign, Trump's then-lawyer Michael Cohen sent $130,000 to Daniels to prevent her from disclosing a 2006 affair with Trump.
Trump, who denies the affair, reimbursed Cohen through installments.
The office, led by DA Alvin Bragg, has been investigating the hush money scandal — which took place in 2016 — for the past five years.