Calls for Barr's resignation erupted across the Democratic Party this week after he testified before the Senate and rebuffed the House twice, first by denying Democrats a full, unredacted version of special counsel Robert Mueller's report, and then by skipping a hearing to review it.
Several Democrats have called on Barr, whom Trump appointed after firing Jeff Sessions as attorney general, to resign.
Meanwhile, Trump told reporters at the White House that he will decide in the coming days whether he will allow former White House lawyer Don McGahn to testify before US lawmakers or whether he will invoke executive privilege to block his testimony. In both hearings he made no mention of a March 27 letter from Mueller objecting to Barr's own letter notifying Congress of the completion of the report.
The public disclosure of Mueller's letter on Tuesday prompted Nancy Pelosi, the top Democrat in Congress, to accuse Barr of committing a crime by lying to Congress.
It isn't yet clear if Barr will overturn the tradition of prosecutors protecting third-parties in order to appease House Democrats.
Peter Carr, spokesman for the special counsel, declined to comment.
"He and he alone as the chief law enforcement officer of the United States was left with the burden and the responsibility to do something after he got that report", said Charles Stimson, a senior legal fellow at the conservative Heritage Foundation.
"It is no accident, it is no coincidence, that the attorney general of the United States is the person responsible for making sure that voter suppression does not happen in our country", Pelosi told reporters a week before the Holder vote, "These very same people who are holding him in contempt are part of a nationwide scheme to suppress the vote". Barr has said he has no objections to Meuller testifying.
Barr has stunned many who gave him the benefit of the doubt by declaring Trump fully cleared of accusations of collusion with Russian Federation and obstruction of justice.
Pelosi also said she lost sleep after watching Barr's testimony Wednesday before the Senate Judiciary Committee, adding she later "connected the dots" linking Barr, senate majority leader Mitch McConnell (R-KY) and president Donald Trump.
Separately on Thursday, Barr failed to show up to a House Judiciary Committee hearing about the Mueller report.
Representative Doug Collins, the top Republican on Nadler's panel, said Democrats are resorting to hyperbole because the Mueller report did not land a knock-out legal blow on Trump.
President Donald Trump told reporters Friday that it will be up to Barr to determine whether Mueller is permitted to testify on the Russian Federation investigation. With Trump seeking re-election next year, Democrats are weighing whether to try to remove the Republican president from office using the impeachment process while pressing forward with demands for information on his taxes, businesses and other topics.
Barr has made available to a select number of lawmakers a less redacted version of the Mueller report that was published on the DOJ website in April, a concession Nadler indicated in his letter would not appease the committee.