Mr Barr said in the summary released last month that Mr Mueller did not find a criminal conspiracy between the campaign and the Kremlin.
Barr testified before a congressional panel on Capitol Hill on Tuesday in his first appearance since releasing a four-page summary of Special Counsel Robert Mueller's Russian Federation investigation.
When a federal appeals court judge ruled two weeks ago that Trump-era legislation and other recent actions meant the entire Affordable Care Act should be overturned, the Justice Department chose to support the ruling - rather than appeal it with a position the department had been advocating previously. Rep. Nita Lowey (D-NY) claimed Barr seemed to "to cherry pick from the report to draw the most favorable conclusion possible for the President". The Democrats are demanding that they see the full report and all its underlying evidence as Trump and his Republican allies are pushing back.
The attorney general appeared before a House appropriations subcommittee to discuss his department's budget request - normally a sleepy affair - but Democrats, in particular, were more interested in asking questions about the report. "First is grand jury information..."
Secondly, any information that would reveal "intelligence sources and methods", Barr testified.
On Monday, the leaders of the House Judiciary Committee agreed to also call on Mueller to testify.
"I personally believe not all of it is going to be great for the White House", Burr said.
Mueller wrote that "while this report does not conclude that the president committed a crime, it also does not exonerate him".
PAFs F-16 was shot down, asserts IAF; Refutes US media reports
Pakistan had officially announced about two aircraft going down but later retracted, saying only one (the Indian) jet was hit. The two nations previously have fought four wars, in 1947, 1965, 1971 and a limited conflict in 1999.
The attorney general has also said that Mueller did not reach a conclusion on whether the president obstructed justice.
"I'm a lawyer. I'm not in charge of health care", Barr told members of the House Appropriations Committee, as Democrats said the Trump administration's position in a lawsuit risked depriving millions of Americans of their health insurance coverage and sharply raising the price of premiums for tens of millions more.
Mr. Mueller turned over his confidential report to Mr. Barr last month following his 22-month-long probe into whether Donald Trump may have colluded with Russian Federation during the presidential campaign and if he then obstructed inquiries into the matter. Democrats have salivated over the quote, hanging their hopes on the possibility that the report does contain damning information on Trump.
Late last month, the attorney general informed lawmakers in writing that he would not submit Mueller's report to the White House to review for any material that might be covered by executive privilege, which allows the president and other senior officials in the executive branch to withhold some information from Congress, the courts and the public.
"The Democrats will never be satisfied, no matter what they get, how much they get, or how many pages they get".
"We had an inkling of what was coming in our direction", he said.
Lowey said the Judiciary Committee has the responsibility and right to subpoena the full report and fight to see any redacted information. "And then I will engage with the chairman of both judiciary committees about that report and any further requests that they have". The third involves information in the report that could interfere with ongoing prosecutions, and fourth, "we intend to redact information that implicated the privacy or reputational interest of peripheral players where there is a decision not to charge them".