READ: White House letter defying subpoena for McGahn's testimony

The White House on Monday told Congress former White House counsel Don McGahn will not comply with a House Judiciary Committee subpoena for his testimony.

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"The Department of Justice (the 'Department') has advised me that Mr. McGahn is absolutely immune from compelled congressional testimony with respect to matters occurring during his service as a senior adviser to the President," White House counsel Pat Cipollone wrote in a letter to House Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerNadler apologized after repeatedly calling Hope Hicks 'Ms. Lewandowski' at hearing Hope Hicks: Trump campaign felt 'relief' after WikiLeaks released damaging info about Hillary Clinton House hearing marks historic moment for slavery reparations debate MORE (D-N.Y.) released by the White House.

Read the full letter below.