Sanders on Trump insult: Crazy that president 'is a racist, a sexist, a xenophobe and a fraud'

Sen. Bernie SandersBernie SandersGabbard moves to New Hampshire ahead of primary Sanders to join youth climate strikers in Iowa Saagar Enjeti unpacks why Kamala Harris's campaign didn't work MORE (I-Vt.) responded to President TrumpDonald John TrumpStates slashed 4,400 environmental agency jobs in past decade: study Biden hammers Trump over video of world leaders mocking him Iran building hidden arsenal of short-range ballistic missiles in Iraq: report MORE calling him "Crazy Bernie" Wednesday by flipping the "crazy" tag back on the president.

"What’s crazy is that we have a president who is a racist, a sexist, a xenophobe and a fraud," Sanders, who announced his 2020 candidacy Tuesday, tweeted.

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"We are going to bring people together and not only defeat Trump but transform the economic and political life of this country."

Trump, who occasionally derides Sanders as "Crazy Bernie," first weighed in Tuesday afternoon on the senator's decision to pursue the Democratic nomination.

"Personally I think he missed his time," Trump told reporters in the Oval Office. "But I like Bernie because he is one person that, you know, on trade he sort of would agree on trade. I'm being very tough on trade, he was tough on trade."

Sanders is pursuing the Democratic nomination for the second time after placing second in the 2016 primary.

He joins a field of candidates including Sens. Elizabeth WarrenElizabeth Ann WarrenGabbard moves to New Hampshire ahead of primary LGBTQ advocates slam Buttigieg for past history with Salvation Army Saagar Enjeti unpacks why Kamala Harris's campaign didn't work MORE (D-Mass.), Kamala HarrisKamala Devi HarrisHarris posts video asking baby if she'll run for president one day Krystal Ball: What Harris's exit means for the other 2020 candidates Saagar Enjeti unpacks why Kamala Harris's campaign didn't work MORE (D-Calif.), Amy KlobucharAmy Jean KlobucharKrystal Ball: What Harris's exit means for the other 2020 candidates Teamsters to host presidential forum with six 2020 Democrats Democrats hit gas on impeachment MORE (D-Minn.) and Cory BookerCory Anthony BookerLGBTQ advocates slam Buttigieg for past history with Salvation Army Harris posts video asking baby if she'll run for president one day Krystal Ball: What Harris's exit means for the other 2020 candidates MORE (D-N.J.).