Biden slams Trump for criticizing Greta Thunberg: 'What kind of president bullies a teenager?'

Former Vice President Joe BidenJoe BidenDes Moines Register endorses Elizabeth Warren as Democratic presidential nominee Sanders faces lingering questions about appeal to women voters George Conway: Witness missing from impeachment trial is Trump MORE slammed President TrumpDonald John TrumpKaine: Obama called Trump a 'fascist' during 2016 campaign Kaine: GOP senators should 'at least' treat Trump trial with seriousness of traffic court Louise Linton, wife of Mnuchin, deletes Instagram post in support of Greta Thunberg MORE for criticizing teenage climate activist Greta Thunberg, saying, “What kind of president bullies a teenager?”

Biden said Trump could learn from the 16-year-old, who was named Time's "Person of the Year," after the president targeted her in a tweet.

“What kind of president bullies a teenager?” the presidential candidate wrote. “@realDonaldTrump, you could learn a few things from Greta on what it means to be a leader.”

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Biden’s tweet came in response to a post from the president telling Thunberg to work on her “Anger Management problem” and to “Chill.” 

Thunberg updated her Twitter bio in response to Trump's remarks, now describing herself as a “teen working on anger management.” The president’s campaign also edited his photo to replace Thunberg on the magazine cover and tweeted it Thursday.

First lady Melania TrumpMelania TrumpThe Hill's 12:30 Report: Trump beefs up impeachment defense with Dershowitz, Starr Trump welcomes LSU to the White House: 'Go Tigers' The Hill's Morning Report — President Trump on trial MORE's "Be Best" campaign designed to stop cyberbullying started trending after the president tweeted about Thunberg.