Special counsel’s office says appointment of acting AG Matt Whitaker ‘has no effect on this case’
Acting Attorney General Matthew Whitaker (left, via screengrab) and special counsel Robert Mueller (right, via the United States' Estonian embassy).

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.

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