President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE accused House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.) of leaking information that Russia has sought to interfere with the Democratic primary to help Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE’s (I-Vt.) campaign.

"Nobody said it to me at all," Trump told reporters Sunday about the reported Russian interference. "They ought to investigate Adam Schiff for leaking that intelligence."

Trump continued his accusations in a tweet later Sunday afternoon without providing evidence to support his claims.

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“Somebody please tell incompetent (thanks for my high poll numbers) & corrupt politician Adam ‘Shifty’ Schiff to stop leaking Classified information or, even worse, made up information, to the Fake News Media. Someday he will be caught, & that will be a very unpleasant experience!” Trump tweeted.

Somebody please tell incompetent (thanks for my high poll numbers) & corrupt politician Adam “Shifty” Schiff to stop leaking Classified information or, even worse, made up information, to the Fake News Media. Someday he will be caught, & that will be a very unpleasant experience! — Donald J. Trump (@realDonaldTrump) February 23, 2020

Schiff denied Trump's accusations in a tweet, telling the president, "Americans decide American elections."

Mr. President, I didn’t say that. But if you wish to quote me, quote this:



”The only thing Americans despise more than foreign actors trying to affect the vote is a president unwilling to do anything to stop it.”



Americans decide American elections. https://t.co/LEbVzb39Jf — Adam Schiff (@RepAdamSchiff) February 22, 2020

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In a subsequent tweet, Schiff called Trump's claims "deflection."

Nice deflection, Mr. President. But your false claims fool no one.



You welcomed Russian help in 2016, tried to coerce Ukraine’s help in 2019, and won’t protect our elections in 2020.



Now you fired your intel chief for briefing Congress about it.



You’ve betrayed America. Again. https://t.co/WlMDaz8stF — Adam Schiff (@RepAdamSchiff) February 23, 2020

An Intelligence Committee official also told The Hill that the president's accusations are categorically false.

"The Chairman does not comment on the substance classified briefings, and the President is trying to divert attention from his blatant firing of the acting [director of national intelligence] for briefing Congress," the official said.

Trump in a tweet Saturday night lamented the fact that he was not told about the reported Kremlin interference, leveling another attack at Schiff alleging the congressman leaked the information.

"'The Kremlin is reportedly backing Bernie Sanders bid to win the White House.' Jon Scott @FoxNews Why didn’t somebody tell me this?" Trump tweeted.

“The Kremlin is reportedly backing Bernie Sanders bid to win the White House.” Jon Scott @FoxNews Why didn’t somebody tell me this? — Donald J. Trump (@realDonaldTrump) February 23, 2020

“Just another Shifty Schiff leak. Isn’t there a law about this stuff?” Trump tweeted.

Just another Shifty Schiff leak. Isn’t there a law about this stuff? https://t.co/JWE0oPhiw9 — Donald J. Trump (@realDonaldTrump) February 23, 2020

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Trump also congratulated Sanders for “a great win” in the Nevada caucuses.

The Washington Post first reported Friday that Russia sought to help Sanders campaign.

Sanders said he was briefed by U.S. intelligence officials about the attempted interference. Lawmakers on the House Intelligence Committee were also reportedly briefed on the matter.

“Unlike Donald Trump, I do not consider Vladimir Putin Vladimir Vladimirovich PutinPutin is about to turn his attention to the American way of life Putin critic Navalny posts photo of himself walking: 'Long' path to recovery FBI chief says Russia is trying to interfere in election to undermine Biden MORE a good friend. He is an autocratic thug who is attempting to destroy democracy and crush dissent in Russia," Sanders said. "Let’s be clear, the Russians want to undermine American democracy by dividing us up and, unlike the current president, I stand firmly against their efforts, and any other foreign power that wants to interfere in our election."

There is no indication from the reports or Sanders's comments that Schiff leaked the information, as Trump is accusing the congressman of doing.

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The New York Times had reported a day earlier that intelligence officials also warned lawmakers in a closed briefing that Russia was interfering to help Trump. That reportedly prompted the president to berate former acting Director of National Intelligence Joseph Maguire Joseph MaguireCongressional Democrats request FBI briefing on foreign election interference efforts Wells Fargo told employees to delete TikTok from work phones Hillicon Valley: Pompeo floats TikTok ban | Civil rights groups slam Facebook after call | Election security funding included in proposal MORE. Trump was also reportedly worried about Schiff, who had led the House's impeachment inquiry against him, being present for the briefing.

Russian agents successfully launched an interference campaign ahead of the 2016 election designed to favor Trump’s campaign that year, according to U.S. intelligence agencies, the Senate Intelligence Committee and the report compiled by former 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.

National security adviser Robert O’Brien said Sunday that he hadn't seen “any intelligence that Russia is doing anything to attempt to get President Trump reelected.”

"I think this is the same old story that we've heard before. ... We've been very tough on Russia, and we've been great on election security. So I think it's a nonstory,” O’Brien said on ABC’s “This Week,” rejecting reports to the contrary.

This report was updated at 1:43 p.m.