President Trump on Sunday accused former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE of colluding with her party to defeat her primary opponent Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.).

“Hillary Clinton colluded with the Democratic Party in order to beat Crazy Bernie Sanders. Is she allowed to so collude? Unfair to Bernie!” Trump said.

Hillary Clinton colluded with the Democratic Party in order to beat Crazy Bernie Sanders. Is she allowed to so collude? Unfair to Bernie! — Donald J. Trump (@realDonaldTrump) June 25, 2017

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Trump has previously said the Democratic Party cheated Sanders out of the nomination and criticized its use of superdelegates.

His latest tweet comes amid probes into Russian meddling in the presidential election and possible collusion between Trump's campaign and Moscow.

Trump in an interview aired Sunday blasted former President Barack Obama Barack Hussein ObamaDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE over Russia's interference, accusing Obama of doing “nothing” before the election.

“Well I just heard today for the first time that Obama knew about Russia a long time before the election, and he did nothing about it. But nobody wants to talk about that,” Trump told “Fox and Friends Weekend.”

“The CIA gave him information on Russia a long time before they even — before the election. And I hardly see it. It's an amazing thing," Trump continued.

The Washington Post reported late last week that Obama was slow and cautious in responding to Russian election interference.