Dean told CNN before he started speaking to Congress that he wasn't a "fact witness" for the Russian Federation probe but hoped that he could give lawmakers some context and point out similarities between Watergate and now. Nadler said the Justice Department will provide some of Mueller's "most important files" and all members of the committee will be able to view them.
Rep. Eric Swalwell, D-Calif., said Tuesday that former White House counsel John Dean's testimony showed how the Trump administration's conduct "rhymes" with the Nixon administration's.
"In light of today's agreement from the Justice Department, it's logical to ask: Is the chairman prepared to rescind his baseless recommendation to hold the attorney general in contempt, or do House Democrats still plan to green-light lawsuits against the attorney general and former White House counsel tomorrow?"
Nadler added, "It is critical that Congress is able to obtain the information we need to do our jobs, ensuring no one is above the law".
According to Nadler's statement, the evidence would include "interview notes, firsthand accounts of misconduct and other critical evidence" collected by Mueller in his probe into collusion and obstruction of justice allegations against the President Donald Trump campaign and administration.
The Democratic-controlled House will vote as previously planned on Tuesday on a measure that would increase pressure on Trump by authorizing the committee to sue the administration in federal court if needed over access to the report.
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For weeks Barr has resisted a subpoena from Nadler's committee for a full, unredacted version of Mueller's 448-page final report and underlying evidence.
The House Oversight Committee plans to hold contempt votes against Barr and Commerce Secretary Wilbur Ross on Wednesday after they defied subpoenas related to the US census.
Later Monday, Trump lashed out at Dean and Democrats who continue to push for evidence of obstruction of justice that could ultimately be used to try and remove the president from office through impeachment.
Nadler said the documents would allow his committee members to perform their 'constitutional duties.' He said it would 'hold the criminal contempt process in abeyance'. Trump's former White House counsel Donald McGahn, in fact, has refused to testify because the White House told him not to.
The procession of hearings and votes in the week ahead is partly created to mollify anxious Democrats who have pushed House Speaker Pelosi to begin impeachment proceedings immediately.
Mr. Cummings said his panel will vote Wednesday to begin contempt proceedings against Mr. Barr and Commerce Secretary Wilbur L. Ross Jr., whose department oversees the Census Bureau.
"I'm hearing from the '70s and they want their star witness back", said Rep. Doug Collins (R-Ga.), the ranking Republican on the committee.