The Manhattan D.A.’s office has significantly escalated its investigation of Donald Trump. Prosecutors have interviewed employees of Trump’s bank and insurance broker recently, according to the New York Times.

It remains unclear whether the office of the Manhattan district attorney, Cyrus R. Vance Jr., will ultimately bring charges. The prosecutors have been fighting in court for more than a year to obtain Mr. Trump’s personal and corporate tax returns, which they have called central to their investigation. The issue now rests with the Supreme Court.

But lately, Mr. Vance’s office has stepped up its efforts, issuing new subpoenas and questioning witnesses, including some before a grand jury, according to the people with knowledge of the matter, who requested anonymity because of the sensitive nature of the investigation.

The protections afford Trump while president will end when he leaves office on January 20th. And while there has been talk of the president pardoning himself and those in his close family and inner circle, those pardons would not cover state crimes.