Regarding the Clinton campaign, the report said investigators "found that the Clinton campaign and the DNC [Democratic National Committee], using a series of cutouts and intermediaries to obscure their roles, paid for opposition research on Trump obtained from Russian sources, including a litany of claims by high-ranking current and former Russian government officials".
The Republican-authored report - released over Democratic objections - was heavily redacted by the intelligence community.
The House panel did find that Russian Federation sought to sow discord in the USA through cyberattacks and social media. "Wow! A total Witch Hunt!".
It called contacts between Russian officials and campaign aides "ill-advised" and said at least one person might have given answers in legal testimony that were "incomplete".
The report, which committee Chairman Devin Nunes said had been "excessively" redacted by United States intelligence agencies, also criticised Trump's 2016 opponent Hillary Clinton for her campaign's use of "high-ranking current and former Russian government officials" in compiling research on the now-US president.
The investigation began with bipartisan promise but ultimately succumbed to factional squabbling.
The 253-page document comes a little over a month after Republican lawmakers on the panel concluded there was no collusion or coordination between President Donald Trump and Russian Federation.
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"A majority of the report's findings are misleading and unsupported by the facts and the investigative record", the Democrats' report stated. The 253-page document is packed with details and assessments, but is also littered with redacted names and blacked-out passages.
In February, a USA federal jury charged 13 Russian nationals and three Russian companies as part of an investigation into alleged interference in the 2016 presidential elections.
Republicans on the House Intelligence Committee released their concluding report on the Russian Federation investigation, prompting Democrats to respond with a 98-page reply criticizing their findings.
Mueller's probe is continuing, as are investigations by the Senate Intelligence and Judiciary Committees.
"Notwithstanding the decision by the Majority to end its work and turn its attention to counter-investigations created to serve the President's interests, the Minority's work on the Russian Federation investigation continues.", Schiff said in a statement Friday.
Emails "indicate that the meeting was arranged at the request of Gen. Flynn or his son", according to the House report, which was made public Friday. Instead he launched a pair of investigations on his own, taking aim at the Justice Department and FBI. Many Twitter users expressed dissatisfaction in the outcome of the GOP's investigation and accused them of halfheartedly probing the issue to protect the president.
Mr. Conaway said the committee had pledged to be "as transparent as possible" with the report.
House Republicans have joined President Trump for months now in trying to raise concern, if not outright alarm bells, that the Federal Bureau of Investigation is inept, biased and even corrupt. The panel also recommended the executive branch "crack down" on leaks by conducting polygraphs.