The House panel did find that Russian Federation sought to sow discord in the USA through cyberattacks and social media.
The report caps an investigation that began with the promise of bipartisanship but quickly transformed into an acrimonious battle between Democrats and Republicans over Russia's meddling in the 2016 election and whether there were any connections with the Trump campaign.
In a sign of the partisan squabbling on the committee, Schiff criticised the chairman, Representative Devin Nunes (Republican-California).
Trump has adamantly insisted neither he nor his campaign colluded with the effort and has been resolute in his belief the Russian effort did not bolster his chances of winning.
Clinton, the report said, paid for research on Trump "using a series of cutouts and intermediaries to obscure their roles".
"It's a witch hunt that's all it is".
They announced that finding in March and released a report on Friday explaining how they arrived at that result. "For instance, the Committee has not received from the Trump campaign and transition all correspondence to and from George Papadopoulos, Carter Page, and other key persons of interest, thereby making it impossible to determine whether the Committee has reviewed the complete universe of relevant correspondence".
The report, which committee Chairman Devin Nunes said had been "excessively" redacted by U.S. 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.
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The committee also did not agree with assessments that Russian President Vladimir Putin preferred Trump to Hillary Clinton.
President Trump has repeatedly said there was "no collusion", and blasted the investigation again Friday as "A total Witch Hunt!'"
Flynn lost his job over the Russian Federation contacts controversy - and as recently as December, even President Trump claimed Flynn had "lied" to agents.
Meantime, while Democrats may be praying the Mueller probe produces more fruit than the House investigation came up with- they'll have a new House Chaplin to lead that prayer.
The release of Friday's report was heavily opposed by Democrats.
Rep. Mike Conaway, R-Texas, said he was "extremely disappointed" with the amount of redactions in the report. Some portions of the public report are redacted for national security reasons.
The panel wrote that intelligence officials should immediately alert presidential candidates and Congress when they discover "legitimate" threats to a campaign.
The House panel is expected to challenge those revisions in hopes of getting more of the report declassified.
Intelligence experts have concluded Russian Federation did it to help Trump win. The panel also recommended the executive branch "crack down" on leaks by conducting polygraphs.