President Donald Trump speaks during a ceremony in the East Room of the White House

The Mueller report “undoubtedly” contains evidence of collusion between Donald Trump and Russia, according to Fox Business legal analyst Judge Andrew Napolitano, contradicting the verdict of attorney-general William Barr and risking the president’s ire.

House Oversight Committee chairman Elijah Cummings has meanwhile warned of a looming “constitutional crisis” ahead as Democrats express growing frustration at what they see as Republican efforts to prevent the full release of the FBI special counsel’s 700-page report into his 22-month investigation.

For his part, President Trump has been busy on Twitter hitting out at an array of targets, from the media to Mexico, Jussie Smollett and House Intelligence Committee chairman Adam Schiff, whose resignation he has called for in response to the congressman's repeated allegations regarding conspiracy with the Kremlin.

A House Democratic aide who briefed reporters Thursday on condition of anonymity said Mr Barr does not intend to give Congress a complete copy of the report from special counsel Robert Mueller.

The aide said Mr Barr spoke with Judiciary Committee Chairman Jerry Nadler late Wednesday and indicated he was redacting grand jury information from the confidential report. While grand jury information is often confidential, it can be unsealed in some situations.

Criminals who worked for Trump Show all 5 1 /5 Criminals who worked for Trump Criminals who worked for Trump Michael Cohen Former lawyer for Donald Trump was sentenced to three years in prison on counts involving evading income tax, false disclosure of the hush money paid to Stormy Daniels and another hush money charge Getty Criminals who worked for Trump Paul Manafort Former campaign manager for Trump Manafort was found guilty in February 2018 of five counts of tax fraud, two counts of bank fraud and one count of failure to disclose a foreign bank account. The crimes occurred prior to his appointment in Trump's campaign Getty Criminals who worked for Trump George Papadopoulos Former Trump campaign adviser Papadopoulos pleaded guilty to lying to the FBI in October 2017. He had lied about making contact with a professor who claimed that the Russians had dirt on Hillary Clinton. He was sentenced to 14 days in jail Getty Criminals who worked for Trump Michael Flynn Former White House National Security adviser Michael Flynn pleaded guilty to lying to the FBI in December 2017. He had lied about conversations that he had with the Russian ambassador to the US during Trump's Presidential campaign. He was not given prison time due to his "significant assistance" to the Mueller investigation Getty Criminals who worked for Trump Rick Gates Deputy chairman of Trump's presidential campaign Gates pleaded guilty to lying to the FBI in February 2018 AFP/Getty

The aide added Mr Nadler offered to work with Mr Barr to have the information unsealed.

During her weekly press conference, House Speaker Nancy Pelosi called Mr Barr’s four-page synopsis “condescending” and “arrogant” and said Democrats need to draw their own conclusions about what Mr Mueller found.

The Democratic chairmen of six House committees have demanded that Mr Barr release the Mueller report to Congress by Tuesday.

Ms Pelosi also defended House Intelligence Committee Chairman Adam Schiff, who faced calls Thursday from Republicans to resign over his comments that there was significant evidence the president and his associates conspired with Russia.

Additional reporting by AP. See The Independent’s live reporting from Washington on Thursday below.

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