The U.S. Attorney’s Office for the Southern District of New York said on Monday that it would join a lawsuit filed by President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE that aims to block a subpoena for his tax returns.

The office said it would file a submission in the case by Wednesday, CNN reports.

The move comes after the Manhattan District Attorney’s Office subpoenaed Trump for his tax returns and other documents dating back to 2011.

The district attorney’s office, led by Cyrus Vance, is investigating the Trump Organization’s handling of hush money payments made to two women who claim they had affairs with Trump, though the president has denied both encounters.

Two weeks ago, Trump responded by suing the district attorney's office, arguing that criminally investigating a sitting president is "unconstitutional” and asking the judge to suspend the subpoena until he is no longer in office.

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The U.S. attorney’s office filed a brief last week saying it was “considering whether to participate in connection with the pending motion for a preliminary injunction," according to CNN.

The case is one of several that are pending in federal courts as Democrats, including some House committees, attempt to get information about Trump’s finances.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) said last week that she’s directed the panels to proceed with their investigations under the "umbrella of impeachment inquiry."