(CNN) The Trump administration will hold back more than 100,000 pages of documents related to Supreme Court nominee Brett Kavanaugh's service because the White House and the Department of Justice have determined they are protected by constitutional privilege, according to a letter to the Senate Judiciary Committee.

William Burck, a lawyer charged by former President George W. Bush with reviewing the documents housed in the presidential library, disclosed the exemptions i n a letter to Judiciary Committee Chairman Chuck Grassley on Friday . Burck explained that, in all, he received just under 664,000 pages of documents and that Bush had directed him to "proceed expeditiously" and "err as much as appropriate on the side of transparency and disclosure."

Burck said he has given the committee "every reviewable" document that he received except those that fell into exemptions that included "presidential records protected by constitutional privilege."

The disclosure comes days before Kavanaugh's confirmation hearings, which are slated to begin Tuesday, and intensifies a battle between Grassley, who says he has produced a record number of documents, and Senate democrats who question the review being led by lawyers for the Trump administration and Bush. Democratic senators argue that Grassley is refusing to produce documents from Kavanaugh's years serving as staff secretary in the White House from 2003 to 2006.

Senate Minority leader Chuck Schumer called the decision to withhold the documents a "Friday night document massacre."

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