Washington (CNN) None of the six Democrats who have been provided access to a less-redacted version of special counsel Robert Mueller's report have gone to the Justice Department to read it, according to a source familiar with the matter.

Republicans and the Justice Department have criticized Democrats for not at least reading the less-redacted version of the report released to lawmakers while they negotiate over access to the fully unredacted report and underlying materials.

Senate Majority Leader Mitch McConnell, Senate Intelligence Chairman Richard Burr and Senate Judiciary Chairman Lindsey Graham have read it, along with House Minority Leader Kevin McCarthy and Rep. Doug Collins, the top Republican on the Judiciary Committee, have seen it, according to the source, while House Intelligence ranking member Devin Nunes has not.

The Justice Department offered 12 congressional leaders -- party leaders and the heads of the Judiciary and Intelligence Committees -- and a staff member each the ability to view a version of the Mueller report that only contained redactions of grand jury material, which the Justice Department has argued it is prohibited by law from sharing without a court order. That version of the report contains material that was redacted in the public report because it was classified, connected to ongoing investigations or contained information about peripheral third parties.

But Democrats rejected that proposal from the Justice Department in their quest to obtain the full, unredacted Mueller report and the special counsel's underlying evidence. They argued they should be allowed to read the full report, with grand jury material, and they also objected to the fact that only the six congressional leaders from each party can read the less-redacted report, pushing for the full Intelligence and Judiciary Committees to be allowed to read it.

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