WASHINGTON - US Attorney General William Barr plans to issue in a matter of weeks a public version of the special counsel's report that found President Donald Trump's 2016 campaign team did not conspire with Russia, as Trump prepared to use the findings against his political opponents.

Democrats attempted to change the subject to healthcare after the report from Robert Mueller appeared to shatter their case that Trump was an illegitimately elected president.

Barr released his own summary of the report's central findings on Sunday but said he needed more time to review the report to determine how much of it could be made public.

A Justice Department official said on Tuesday that Barr's plan was to release a public version in "weeks, not months". Congressional Democrats have demanded Barr turn over the report to them by April 2, which would only leave a week for the Justice Department to complete its review.

The Justice official said there was no plan to share an advance copy of the report with the White House.

Some portions of Mueller's confidential report contain materials that arose during secret grand jury proceedings.

Federal rules generally prohibit the government from releasing that information to the public.

The report also contains information about ongoing criminal investigations that Mueller referred to other US attorneys' offices.

Barr has not yet revealed a precise date for when the final public version might be ready.

The Justice Department has not commented on the Democrats' request that it be released to Congress by next week.

Trump and his top aides attacked unidentified political opponents for starting the campaign investigation, calling the actions treasonous and worth probing.

"I think what happened was a disgrace," Trump told reporters on a visit to the US Capitol, where he had lunch with Republican senators.

Reuters