President Donald Trump revived his campaign trail nickname for U.S. Sen. Elizabeth Warren, D-Massachusetts, Friday as he slammed reports that the Democratic National Committee favored Hillary Clinton over other party candidates in 2016.

Calling Warren "Pocahontas," the Republican contended that "the real story on collusion" in the 2016 election involves his Democratic rival -- not his own campaign, which has faced allegations of working with Russian officials.

The president, who has long criticized the Democratic Party's nomination process, pointed to an interview in which Warren appeared to agree with former interim DNC Chairwoman Donna Brazile's claims that the Clinton campaign essentially "rigged" the Democratic primary contest with U.S. Sen. Bernie Sanders.

Trump further called on the U.S. Department of Justice and Federal Bureau of Investigation to look into Brazile's allegations.

"The real story on Collusion is in Donna B's new book. Crooked Hillary bought the DNC & then stole the Democratic Primary from Crazy Bernie!" he tweeted. "Pocahontas just stated that the Democrats, lead by the legendary Crooked Hillary Clinton, rigged the Primaries! Lets go FBI & Justice Dept."

The real story on Collusion is in Donna B's new book. Crooked Hillary bought the DNC & then stole the Democratic Primary from Crazy Bernie! — Donald J. Trump (@realDonaldTrump) November 3, 2017

Pocahontas just stated that the Democrats, lead by the legendary Crooked Hillary Clinton, rigged the Primaries! Lets go FBI & Justice Dept. — Donald J. Trump (@realDonaldTrump) November 3, 2017

Trump's tweets came hours after Warren told CNN that Brazile's claims suggest a "real problem" and that Democrats need to hold their party accountable.

When pressed on whether she agreed with claims the primary process had been rigged, the senator, who ultimately endorsed Clinton over Sanders at the end of the 2016 Democratic primary, said "Yes."

Do you agree with the notion that the DNC was rigged in Hillary Clinton's favor?



Elizabeth Warren: Yes https://t.co/TIoytO15Ca pic.twitter.com/TjkBS0mbB8 — The Lead CNN (@TheLeadCNN) November 2, 2017

Brazile accused the Clinton campaign of a "secret takeover of the DNC" in her book and a Politico op-ed released this week, contending that "if the fight (between Clinton and Sanders) had been fair, one campaign would not have control of the party before the voters had decided which one they wanted to lead."

Trump previously revived his nickname for Warren in a late June interview with Fox & Friends, calling the senator a "hopeless case" and arguing she has "got a lot of hatred, a lot of anger."

"I call her Pocahontas, and that's an insult to Pocahontas," he added.

The Republican repeatedly referred to Warren -- one of his most outspoken critics -- as "Pocahontas" throughout his 2016 campaign. The nickname is a nod to a 2012 Senate campaign controversy surrounding Warren's Native American heritage claims