The White House has invoked “executive privilege” to block the release of Special Counsel Robert Mueller’s Russia report, potentially thwarting Democrat attempts to view its full and unredacted contents. 

The announcement dramatically ramps up political tensions in Washington as a Democratic-led US congressional panel moved toward holding Attorney General William Barr in contempt for refusing to hand over the document.

Barr has refused to comply with a subpoena by the House Judiciary Committee to provide an unredacted version of the report and its underlying evidence, Reuters reports.

The redacted Mueller report details extensive contacts between Trump’s 2016 campaign and Moscow as well as the campaign’s expectation of benefiting from Russia’s actions.

It also describes a series of actions Trump took to try to impede Mueller’s investigation.

Executive privilege is a right claimed by presidents to withhold information about internal executive branch deliberations from other branches of government.

House Judiciary Committee chairman Jerrold Nadler said the White House was “misapplying the doctrine of executive privilege” with a decision that “represents a clear escalation in the Trump administration’s blanket defiance of Congress’s constitutionally mandated duties”.

“I can only conclude that the president now seeks to take a wrecking ball to the Constitution of the United States of America,” said Democratic Representative Sheila Jackson Lee.

The White House said the actions of Democrats forced the move.

“Faced with Chairman Nadler’s blatant abuse of power, and at the Attorney General’s request, the President has no other option than to make a protective assertion of executive privilege,” said White House spokeswoman Sarah Sanders.

House Speaker Nancy Pelosi, the top Democratic in Congress, said Trump’s moves to thwart congressional subpoenas were obstructing lawmakers’ oversight of his administration.

“Every single day the president is making the case” and “he’s becoming self-impeachable,” Pelosi told the Washington Post shortly before Trump invoked executive privilege, referring to the impeachment process in Congress for removing a president from office.

Trump is stonewalling numerous investigations by the Democrats, who control the House, of his administration, family and business interests, with court action likely to follow.

The Judiciary Committee was slated to vote on a resolution recommending that the full House find Barr in contempt of Congress, even as committee staffers and Justice Department officials worked behind the scenes in the hopes of a deal to avert such action.

“The American people see through chairman Nadler’s desperate ploy to distract from the President’s historically successful agenda and our booming economy. Neither the White House nor Attorney General Barr will comply with chairman Nadler’s unlawful and reckless demands,” Sanders said.

Judiciary Committee Republicans condemned the move toward holding Barr in contempt.

“What a cynical, mean-spirited, counterproductive and irresponsible step it is,” said the panel’s top Republican, Doug Collins.

Barr last month released a 448-page redacted version of Special Counsel Robert Mueller’s report on his 22-month investigation into Russian election meddling in the 2016 presidential election.

Nadler subpoenaed the full document and all underlying evidence, saying the material was necessary for lawmakers to determine whether Trump obstructed justice by trying to impede the Mueller probe. Barr missed two subpoena deadlines for turning over the material, the latest on Monday.

“We remain unanimously determined on our side of the aisle to get the unredacted report, as we’ve demanded,” Representative Jamie Raskin, a Democrat on Nadler’s committee, told reporters.

On Tuesday, the Trump administration stymied a separate effort by House Judiciary Committee Democrats to subpoena records from former White House counsel Don McGahn, directing him not to provide the documents sought by the panel.

Mueller’s report said McGahn told investigators that Trump unsuccessfully pressured him to remove Mueller and then asked him to deny that Trump had done so. The accounts are based partly on the documents sought by House Democrats.

The Trump administration has refused to cooperate with congressional probes in at least a half-dozen instances, including Treasury Secretary Steven Mnuchin’s decision on Monday to deny a request for Trump’s tax returns from the Democratic chairman of the House tax committee.