NEW YORK — President Donald Trump asked a federal judge Thursday to block an effort by New York prosecutors to obtain his tax returns.

Trump’s attorneys filed a lawsuit in U.S. District Court in New York against the Manhattan district attorney, Cyrus R. Vance Jr., who recently subpoenaed the president’s accounting firm for eight years of Trump’s state and federal returns.

The lawsuit was not immediately made public. But Trump lawyer Jay Sekulow told The Associated Press the lawsuit is intended “to address the significant constitutional issues at stake in this case.”

A message was left with Vance seeking comment. Trump’s accounting firm declined to comment.

The lawsuit opens a new legal front in Trump’s long-running fight to prevent his tax returns from becoming public. It comes as the Republican president already is fighting efforts by Democratic-led congressional committees to obtain his tax returns and other records that could provide a window into his finances.

Trump and three of his children filed a lawsuit in April seeking to block two House committees from getting records that his longtime lender, Deutsche Bank, has said includes tax returns. And in July, the president sued to block the application of a new state law in New York that could allow a House committee to obtain his state tax returns.

Vance also has subpoenaed the Trump Organization for records related to payments that former Trump lawyer Michael Cohen helped arrange to a porn actress who claimed she had an affair with Trump. The Democratic district attorney is also pursuing a mortgage fraud case against former Trump campaign chairman Paul Manafort.

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