Trump working on labels for 2020 Dems: report

President TrumpDonald John TrumpWHCA calls on Trump to denounce video depicting him shooting media outlets Video of fake Trump shooting members of media shown at his Miami resort: report Trump hits Fox News's Chris Wallace over Ukraine coverage 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 ClintonVideo of fake Trump shooting members of media shown at his Miami resort: report Ronan Farrow exposes how the media protect the powerful Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' 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 CruzCruz: 'Of course' it's not appropriate to ask China to investigate Bidens Sunday Show Preview: Trump's allies and administration defend decision on Syria O'Rourke raises .5 million in third quarter 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 WarrenSanders can gain ground by zeroing in on corruption Biden praises Buttigieg for criticizing GOP attacks: 'That's a good man' Warren enters crucial debate with big momentum 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.