House Democrats rapidly attacked Attorney General William Barr‘s credibility Wednesday ahead of a press conference he gave Thursday morning about the redacted version of special counsel Robert Muellers report.

Rep. Jerry Nadler (D-N.Y.), the House Judiciary Committee’s chairman, was among several Democrats to accuse of Barr of spinning Mueller’s report to favor President Donald Trump. Reports that Justice Department officials have already exchanged information about the special counsel’s conclusions with the White House only caused more anger from Congress.

House Speaker Nancy Pelosi (D-Calif.) also slammed Barr on Twitter:

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Nadler and Pelosi were also among several Democrats who called for Mueller to testify in order to clarify any findings and keep the process surrounding the release of his report independent and impartial.

Rep. Hakeem Jeffries (D-N.Y.), the House Democratic Caucus chairman, was even more sharp in his criticism of Barr, tweeting “keep your mouth shut.”

Meanwhile, some GOP lawmakers like Rep. Doug Collins (R-Ga.), the top-ranking Republican on the House Judiciary Committee, took aim at Democrats and accused Nadler of “trying to spin” Mueller’s report. Nadler had said Barr was responsible for “waging a media campaign” on behalf of Trump.