Just one day after Barr released his principal conclusions, Nadler, along with five other committee chairs, sent him a letter mandating that they receive the entire report by April 2.
The New York Times and the Washington Post reported that some investigators were unhappy with the way Mr Barr had described their findings, in a sign of tensions between some members of Mr Mueller's team and administration officials overseeing the report's release.
He also said Mr Mueller reached no conclusion on whether the president obstructed the federal investigation, instead setting out "evidence on both sides" of the question. But Barr, in consultation with Deputy Attorney General Rod Rosenstein, concluded that there was not enough evidence to accuse Trump of obstruction.
Daniel Lazare, a journalist and author of three books - "The Frozen Republic", "The Velvet Coup" and "America's Undeclared War" - told Radio Sputnik's Loud and Clear on Thursday that the leaks were "unimpressive" and that the fuller Mueller report would "probably be more embarrassing to the [New York] Times and the Washington Post when it's finally released than it will be to Trump".
"But if that doesn't work out, in a very short order we will issue the subpoenas", he said.
FBI Director Christopher Wray told the House Appropriations Committee Thursday that he has not read Mueller's report.
Some investigators are also concerned that Barr's review of the report has already shaped the public's perception of the probe before the full report has been released. Almost two weeks since the report was submitted to the Attorney General, they're showing their frustration with his summary.
AAF suspending operations 8 games into season
According to Mike Florio of ProFootballTalk , the league isn't officially folding yet, but it is suspending operations. Just eight weeks into its inaugural season, the Alliance of American Football ( AAF ) has suspended operations .
Since the delay, the House judiciary committee have approved subpoenas to access the document. "That's my view. It's a game-changer", Gene Rossi, a former Department of Justice prosecutor, said.
The demand could set up a constitutional showdown over whether the House has a right to demand normally secret grand jury materials that could hurt the president.
Although Democrats at the moment are using the subpoena as a warning rather than an official enforcement tool - House Judiciary Chairman Jerrold Nadler said he would only issue it if absolutely necessary - it highlights yet another step in what seems to be an inevitable showdown between the legislative and executive branches.
Trump recounted his history of frustration with the paper's reporting.
"I hope to raise public awareness and support our politicians in their effort to have the full Mueller report released immediately", Flythe said.
Republicans on the Judiciary Committee, who have been defending Trump throughout the Mueller investigation, decried the Democrat majority's actions as perpetuating fabricated claims created to undermine Trump and his presidency.
Lawmakers and observers say it's too early to know how the tussle between investigators in Congress and this White House will compare with previous times when the opposition took over - especially in the House, where it's much easier for the majority party to work its will.