The Manhattan District Attorney’s Office headed by Cy Vance has sent a grand jury subpoena to President Donald Trump’s accounting firm to get his tax returns and corporate tax returns for the past 8 years, a person with direct knowledge of the matter tells NBC News.

The subpoena, first reported by the New York Times, stems from Vance’s criminal investigation into the Trump Organization about payments made to two women who have alleged affairs with the president.

Legal experts with such requests says that the subpoena will likely focus not just on the tax returns but will likely also ask for the underlying documents used to generate the tax returns such as bank statements, expense statements, and other financial documents.