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

Sen. Bernie SandersBernie SandersHarris readies a Phase 2 as she seeks to rejuvenate campaign 2020 Dems put spotlight on disabilities issues Lee, Sanders introduce bill to tax Wall Street transactions MORE (I-Vt.) responded to President TrumpDonald John TrumpFeinstein, Iranian foreign minister had dinner amid tensions: report The Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign 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 WarrenThe Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign 2020 Dems put spotlight on disabilities issues MORE (D-Mass.), Kamala HarrisKamala Devi HarrisThe Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign 2020 Dems put spotlight on disabilities issues MORE (D-Calif.), Amy KlobucharAmy Jean KlobucharCNN's O'Rourke town hall finishes behind Fox News, MSNBC Anita Hill: Female 2020 Democrats 'not being taken seriously' Harris seeks Iowa edge with army of volunteers MORE (D-Minn.) and Cory BookerCory Anthony BookerHarris readies a Phase 2 as she seeks to rejuvenate campaign T.I., Charlamagne Tha God advocate for opportunity zones on Capitol Hill Overnight Health Care — Presented by PCMA — CBO officials testify on pros and cons of 'Medicare for All' | Booker vows to form White House office on abortion rights | Measles outbreak spreads with cases now in half the country MORE (D-N.J.).