Trump working on labels for 2020 Dems: report

President TrumpDonald John TrumpTrump says inviting Russia to G7 'a question of common sense' Pentagon chief does not support invoking Insurrection Act Dershowitz: Does President Trump have power to declare martial law? MORE is reportedly working on possible nicknames for his potential 2020 Democratic challengers as the field of nominees continues to grow.

The Associated Press reports that sources close to the president have been working with Trump on labels for specific 2020 candidates. Two sources with knowledge of Trump's 2020 plans told the AP that the president has begun testing nicknames on aides and advisers as he prepares to reveal them publicly.

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The president also plans to use early campaign rallies, the sources told the AP, to test the waters for nicknames he may lob at his potential opponents in the months ahead.

Trump famously used nicknames against a number of his opponents in 2016, including Republicans.

He labeled his Democratic presidential opponent, Hillary ClintonHillary Diane Rodham ClintonTrump, Biden battle to shape opinion on scenes of unrest Sessions accepts 'Fox News Sunday' invitation to debate, Tuberville declines The Memo: Trump lags in polls as crises press MORE, "Crooked Hillary" during the general election, a moniker that some experts say contributed to Clinton's overall difficulties proving her trustworthiness among voters. The president also regularly referred to Republican primary opponents Sen. Ted CruzRafael (Ted) Edward CruzGOP senators dodge on treatment of White House protesters Houston police chief responds to Trump advice on protests: 'Keep your mouth shut' Trump's vow to deploy military faces GOP pushback MORE (Texas) as "Lyin' Ted" and former Florida Gov. Jeb Bush as "low energy."

White House sources told the AP that Sen. Elizabeth WarrenElizabeth WarrenThe Hill's Morning Report - Protesters' defiance met with calls to listen Biden wins DC primary Warren asks Pentagon IG to probe military role in Trump's protest response MORE's (D-Mass.) campaign announcement had been a particular target of the president.

“If Elizabeth Warren, often referred to by me as 'Pocahontas,' did this commercial from Bighorn or Wounded Knee instead of her kitchen, with her husband dressed in full Indian garb, it would have been a smash!” Trump tweeted earlier this year following Warren's announcement.

Trump has frequently called Warren "Pocahontas," a reference to Warren's past claims of Native American ancestry and one that many have argued is racist in nature.

According to recent polls, Trump trails a number of announced Democratic candidates as well as some others largely thought to be considering runs for the White House.