President Trump on Sunday lashed out in a series of tweets over the ongoing investigation into Russian interference in the 2016 election and what he termed a "lack of investigation" into Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE.

“Never seen such Republican ANGER & UNITY as I have concerning the lack of investigation on Clinton made Fake Dossier,” Trump tweeted.

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“Instead they look at phony Trump/Russia 'collusion,' which doesn’t exist. The Dems are using this terrible (and bad for our country) Witch Hunt for evil politics, but the R’s are now fighting back like never before. There is so much GUILT by Democrats/Clinton, and now the facts are pouring out. DO SOMETHING!” Trump tweeted.

The president’s outrage on Sunday was apparently prompted by a Washington Post report earlier this week that a lawyer working for Clinton’s campaign and the Democratic National Committee (DNC) helped fund an unverified dossier that contains allegations about Trump and his ties to Russia as well as more salacious charges.

Trump claimed the dossier cost $12 million, which is apparently a reference to the amount the law firm Perkins Coie was paid to represent the Clinton campaign and the DNC during the 2016 campaign. Perkins Coie retained the firm Fusion GPS to conduct research on Trump, but the law firm did a variety of other work for Clinton and the DNC.

Trump also cited an Obama-era Uranium One deal with Russia, the loss of some of Clinton’s emails during her tenure as secretary of State and “the Comey fix" — apparently meaning former FBI Director James Comey's decision to clear Clinton of charges during the election — as sources of outrage.

Never seen such Republican ANGER & UNITY as I have concerning the lack of investigation on Clinton made Fake Dossier (now $12,000,000?),.... — Donald J. Trump (@realDonaldTrump) October 29, 2017

...the Uranium to Russia deal, the 33,000 plus deleted Emails, the Comey fix and so much more. Instead they look at phony Trump/Russia,.... — Donald J. Trump (@realDonaldTrump) October 29, 2017

..."collusion," which doesn't exist. The Dems are using this terrible (and bad for our country) Witch Hunt for evil politics, but the R's... — Donald J. Trump (@realDonaldTrump) October 29, 2017

...are now fighting back like never before. There is so much GUILT by Democrats/Clinton, and now the facts are pouring out. DO SOMETHING! — Donald J. Trump (@realDonaldTrump) October 29, 2017

Special counsel Robert Mueller is looking into the dossier, as well as Russian interference in the 2016 election and alleged ties between the Kremlin and presidential candidates.

A federal grand jury has approved the first charges in Mueller’s investigation, CNN reported Friday. Those charged could be taken into custody as soon as Monday, though it’s unclear what the charges are because they have been sealed.

Trump earlier this week claimed on Twitter that it’s “commonly agreed” he did not collude with Russia. A member of the Senate Intelligence Committee on Sunday pushed back on that statement, saying “it’s way premature to say some kind of conclusion has been reached.”

The president has consistently denied collusion between his campaign and Moscow and has called the ongoing investigation a "witch hunt."

— Updated 10:50 a.m.