Special counsel Robert Mueller’s prosecutors argued in a new legal brief that President Donald Trump’s controversial appointment of Matt Whitaker will not impact their ongoing investigation.

“The President’s designation of Acting Attorney General Matthew G. Whitaker on November 7, 2018, has no effect on this case,” the special counsel’s office argued in a new legal brief filed in Washington, DC.

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Also on Monday, Sens. Richard Blumenthal (D-CT), Sheldon Whitehouse (D-RI), and Mazie K. Hirono (D-HI) sued to block the appointment.