Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) said Sunday that he believes there's evidence "in plain sight" that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE colluded with the Russians.

"I think there’s plenty of evidence of collusion or conspiracy in plain sight," Schiff said on CBS's "Face the Nation."

The congressman was responding to assertions from White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE that Trump's claims of a "witch hunt" and "hoax" refer specifically to claims he was elected with the help of Russia, not the broader investigation into Russian influence campaigns.

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Schiff disputed that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE has thus far not presented any evidence of collusion. However, he acknowledged that the evidence may not be enough to prove beyond a reasonable doubt that Trump colluded with Russia.

Schiff has been among the most outspoken critics of Trump on the issue of Russian interference in the 2016 election. He blasted the president on Sunday for his refusal to unequivocally condemn Russian President Vladimir Putin over the issue during a summit between the two presidents last month, and warned it could encourage Russia to continue influencing future elections.

"As long as Russia interferes on Donald Trump’s side in the midterms, Vladimir Putin can count on the president not to call him out," Schiff said.

In an unusual move, the White House sent national security adviser John Bolton, Director of National Intelligence Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE, Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE, FBI Director Christopher Wray and National Security Agency Director Gen. Paul Nakasone to the White House briefing last week to detail their agencies' efforts to address election meddling.

Each official specifically called out Russia and cautioned that they continue to see Russian efforts to interfere.

Trump, however, has cast doubt on that conclusion. He drew significant backlash after he met with Putin in July, when Trump noted Putin's "powerful" denials of Russian interference.