Trump working on labels for 2020 Dems: report

President TrumpDonald John TrumpTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Pentagon investigator probing whether acting chief boosted former employer Boeing Trump blasts McCain, bemoans not getting 'thank you' for funeral 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 mocks wind power: 'When the wind doesn't blow, just turn off the television' Trump's approval rating stable at 45 percent Kellyanne Conway: 'I think my gender helps me with the president' 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 CruzO'Rourke raised .1 million from over 128,000 donors on campaign's first day O'Rourke on Israeli-Palestinian conflict: 'We don't have the best negotiating partners on either side' O'Rourke: 'I think we can win Texas' in 2020 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 WarrenWarren, Klobuchar call on FTC to curtail use of non-compete clauses Pollster says 'it's certainly not looking good' for Trump ahead of 2020 Big Tech is not the enemy, Sen. Warren 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.