Trump has referred to Vermont Sen. Bernie Sanders as Crazy Bernie since the 2016 election.Former Vice President Joe Biden is a frequent target of Trump's, who he routinely refers to as Sleepy Joe in an effort to paint the Democrat as low energy.Trump also calls Biden Creepy to mock him for inappropriate behavior around women. Read more: The 23 women who have accused Trump of sexual misconductBefore boarding Marine One on Tuesday, Trump gave Biden a new nickname, saying, I call him 'One Percent Joe,' because until Obama came along, he didn't do very well.Trump uses Pocahontas for Massachusetts Sen. Elizabeth Warren. He uses it as a slur against Warren's past claim of Native American heritage. When Warren announced her 2020 presidential bid, Trump also alluded to the forced relocation of Native Americans in the 1800s, know as the Trail of Tears.Trump has called Pete Buttigieg Alfred E. Neuman, suggesting the South Bend, Indiana mayor looks like the famous character from MAD Magazine.When Minnesota Sen. Amy Klobuchar kicked off her 2020 presidential campaign in the middle of a blizzard, Trump wrote on Twitter that she looked like a Snowman(woman)!Trump branded New York Sen. Kirsten Gillibrand a lightweight in 2017 after she called for him to resign from the White House.As a New Yorker, Trump is no stranger to current New York City Mayor Bill de Blasio, who he called the worst mayor in the U.S. in May. Read more: 9 reasons why Trump could win reelection 9 reasons why Trump could lose reelection Joe Biden's running as a bipartisan moderate, but he keeps flip-flopping on key policy issues to please the Democratic base 6 Democrats would beat Trump if the election were held today, according to a new national poll