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Donald Trump has accused House Intelligence Chairman Adam Schiff of leaking claims that Russia is trying to help Bernie Sanders win the Democratic nomination.
He used it to push his theory that the party will attempt to cheat the self-described democratic socialist out of victory: "What it could be is, you know, the Democrats are treating Bernie Sanders very unfairly and it sounds to me like a leak from Adam Schiff because they don't want Bernie Sanders to represent them.
"It sounds like it's '16 all over again for Bernie Sanders."
The Washington Post first reported Friday that Russia sought to help Mr Sanders' campaign.
Mr Sanders said: "Unlike Donald Trump, I do not consider Vladimir Putin a good friend. He is an autocratic thug who is attempting to destroy democracy and crush dissent in Russia."
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 Mr Trump.
On Sunday national security adviser Robert O'Brien disputed the idea of Russia meddling to favour Mr Trump's reelection.
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