US President Donald Trump says he has not read Robert Mueller's report investigating contacts between his 2016 campaign and Russia that his Democratic opponents say should be released in full.

Key points: US Attorney-General William Barr plans to make a redacted copy of the report public later this month

Congressional Democrats have indicated they will fight those redactions in court

Mr Barr concluded there was not enough evidence to show Mr Trump committed the crime of obstruction

"I have not read the Mueller Report yet, even though I have every right to do so," Mr Trump wrote on Twitter. "Only know the conclusions, and on the big one, No Collusion."

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US Attorney-General William Barr has said he plans to make public a redacted copy of the nearly 400-page investigative report into Russian interference in the 2016 election by the middle of this month, if not sooner.

On March 22, Mr Mueller completed his 22-month probe and Mr Barr sent a four-page letter to Congress two days later outlining the main findings.

Mr Barr told Congress members the investigation did not establish that members of Mr Trump's election campaign conspired with Russia, but also did not exonerate the President on obstruction of justice.

Mr Barr said he had concluded there was not enough evidence to show that Mr Trump committed the crime of obstruction. But news media reports this week said members of Mr Mueller's team were unhappy with the way Mr Barr, a Trump appointee, had characterised the report's conclusions.

Asked in an interview with Fox and Friends Weekend about calls for the release of the full confidential report, Mr Trump said: "It's really up to the Attorney-General, whatever he wants to do."

In another tweet, Trump called the report "a total waste of time".

Mr Barr did not meet a demand by Democrats in the US House of Representatives to provide the unredacted report to Congress members by April 2.

He told Congress in a letter last week he must redact material that was presented to a grand jury, as required by law, as well as information that could reveal US intelligence agencies' sources and methods.

Congressional Democrats have indicated they will fight those redactions in court if the subpoena is ignored.

Russia's Government has denied interfering in the US election.

Fight begins over Donald Trump's tax returns

A lawyer for Mr Trump has blasted US House Democrats' request for six years of Mr Trump's tax returns as "a misguided attempt" to politicise the tax laws, accusing them of harassment and interference in IRS audits.

In a statement that mapped out the legal battlefield ahead, William Consovoy said the request, formally filed on Wednesday by US House of Representatives tax committee Chairman Richard Neal, flouts "constitutional constraints".

"The requests for his private tax information are not consistent with governing law, do not advance any proper legislative purpose, and threaten to interfere with the ordinary conduct of audits," Mr Consovoy said.

"We are confident that this misguided attempt to politicise the administration of the tax laws will not succeed."

One of the many investigations targeting Mr Trump on Capitol Hill and in the US court system, the House Democrat's probe into the President's tax returns could pull back the curtain on his business empire and his reputation as a savvy dealmaker.

Unlike previous presidents over recent decades, Mr Trump has refused to make public past tax returns, while retaining ownership in many enterprises, ranging from golf courses and hotels, to Trump Tower in New York City and his Mar-a-Lago private club in Florida.

Concerns about possible conflicts of interest have simmered since Mr Trump moved into the White House in January 2017, along with lingering questions from his presidential campaign about his net worth, tax profile and past financial dealings.

Seeking answers to such questions, Mr Neal this week invoked a law that gives the head of the tax committee the power to ask the Internal Revenue Service for a president's returns. He is seeking both Mr Trump's personal and business tax returns.

Reuters