Washington: The US Senate Intelligence Committee concurred with spy agencies' findings that Russia sought to boost now-President Donald Trump's 2016 campaign, according to a declassified bipartisan report.

Vladimir Putin tried to help Donald Trump win in 2016. Credit:AP

The report found that the Central Intelligence Agency, National Security Agency and Federal Bureau of Investigation had coherent and well-constructed grounds to conclude that Russian President Vladimir Putin aimed to undercut Trump's 2016 rival, Democrat Hillary Clinton.

Trump, who has consistently bristled at suggestions that foreign interference helped his upset 2016 victory, has sought to discredit the intelligence agencies' findings as the politically charged work of a "deep state." Russia has denied that it was behind any efforts to meddle in US elections.

The Senate report - the fourth of five chapters so far released - found that the CIA and FBI had high confidence in their findings that Russia was trying to boost Trump's chances, while the NSA was only moderately confident on that point.