Rep. Matt Cartwright said the committee needs to be judicious in using the power of the purse to force lawmaker positions because "we have to be the sober ones in the room, we have to be the grownups here on appropriations, because we work for the American people".
Lowey, the chair of the full House Appropriations Committee, blasted Barr for his "unacceptable handling of special counsel Robert Mueller's report".
Barr said he would not discuss the report further, until it's released.
Mueller's team, which was barely quoted in Barr's letter, has made clear that it did not exonerate the president.
Asked by House Democrats about how he was able to review Mueller's lengthy report and summarize its principal findings within two days, Barr said he worked closely with Deputy Attorney General Rod Rosenstein, who had had supervised the probe. He said of Barr: "He has been unresponsive to our requests". He said he could be open to eventually releasing some of the redacted material after consulting with congressional leaders, but he drew a line against grand jury information, which would require court approval.
Barr said he is working with the Special Counsel to identify information that falls under those four categories, and that any redactions will be color-coded and accompanied by explanatory notes describing the basis for that redaction.
So as of March 29, there were "no plans to submit the report to the White House for a privilege review". More likely, the report will include a series of troubling facts, many of which we already know, but none of which are enough to could convince Republicans to turn on Trump.
But one quote from Mueller's conclusions that Barr revealed suggested a different view on obstruction.
Barr gave no indication of how much of the report will be obscured but said he was working with Mueller on restricting details about secret grand jury information, US intelligence gathering and ongoing criminal cases as well as potentially damaging information about peripheral players who were not charged in the Russian Federation probe.
The Attorney General kicked the can down the road, saying that he would testify about the exoneration issue after the release of the report.
Democrats pressed Barr on his decision to release a four-page summary of Mueller's conclusions, particularly in light of reports that some on Mueller's team have told others they were unsatisfied with how Barr characterized the investigation.
She also grilled Barr on how he managed to write his March 24 letter just two days after receiving Mueller's report, which is reportedly 300 to 400 pages.
Mueller sent his final report to Barr on March 22, ending his nearly two-year investigation into potential ties between the Trump campaign and Russian Federation.
He asked whether the Justice Department would look into whether the Federal Bureau of Investigation should have sought a court order to conduct surveillance on former Trump campaign adviser Carter Page.
Barr said in a four-page summary of Mueller's main conclusions that Mueller didn't find a criminal conspiracy between the campaign and the Kremlin. He has also said that Mueller did not reach a conclusion on whether the president obstructed justice, instead presenting evidence on both sides of the question.