Top Democrats Nancy Pelosi and Chuck Schumer say Attorney General William Barr is "not a neutral observer" and they urge full release of special counsel Robert Mueller's report into Russian meddling in the 2016 US election.
Mueller's report did not find President Donald Trump committed a crime but also does not exonerate him, according to a summary of the findings.
Pelosi, the House speaker, and Schumer, the Senate Democratic leader, said on Sunday that Barr's letter to Congress about the report "raises as many questions as it answers."
In a joint statement, the leaders says that Barr's past "bias" against the special counsel inquiry shows he is "not in a position to make objective determinations"
They say that "the fact that Mueller's report does not exonerate the president on a charge as serious as obstruction of justice demonstrates how urgent it is that the full report and underlying documentation be made public without any further delay."
Senate Majority Leader Mitch McConnell, meanwhile, says Trump was right about the Russia investigation.
He said Barr's summary of Mueller's investigation confirmed Trump's account that there was "no effort" by his campaign "to conspire or coordinate with Russia" to influence the 2016 election.
But McConnell declined to call for the report's full release, as many Democrats want.
The White House is claiming vindication and "complete exoneration" of the president.
