Trump working on labels for 2020 Dems: report

President TrumpDonald John TrumpO'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms Objections to Trump's new immigration rule wildly exaggerated 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 ClintonLewandowski on potential NH Senate run: If I run, 'I'm going to win' Fighter pilot vs. astronaut match-up in Arizona could determine control of Senate Progressive Democrats' turnout plans simply don't add up 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 CruzTrump moves forward with F-16 sale to Taiwan opposed by China The Hill's Campaign Report: Battle for Senate begins to take shape O'Rourke says he will not 'in any scenario' run for Senate MORE (Texas) as "Lyin' Ted" and former Florida Gov. Jeb Bush as "low energy."

White House sources told the AP that Sen. Elizabeth WarrenElizabeth Ann WarrenPossible GOP challenger says Trump doesn't doesn't deserve reelection, but would vote for him over Democrat Joe Biden faces an uncertain path The Memo: Trump pushes back amid signs of economic slowdown 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.