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

Sen. Bernie SandersBernard (Bernie) SandersWarren, Klobuchar call on FTC to curtail use of non-compete clauses RNC says it raised .6 million in February Pollster says 'it's certainly not looking good' for Trump ahead of 2020 MORE (I-Vt.) responded to President TrumpDonald John TrumpTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Pentagon investigator probing whether acting chief boosted former employer Boeing Trump blasts McCain, bemoans not getting 'thank you' for funeral 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 WarrenWarren, Klobuchar call on FTC to curtail use of non-compete clauses Pollster says 'it's certainly not looking good' for Trump ahead of 2020 Big Tech is not the enemy, Sen. Warren MORE (D-Mass.), Kamala HarrisKamala Devi HarrisJ.J. Abrams, Shonda Rhimes to host Kamala Harris fundraiser Warren, Klobuchar call on FTC to curtail use of non-compete clauses Pollster says 'it's certainly not looking good' for Trump ahead of 2020 MORE (D-Calif.), Amy KlobucharAmy Jean KlobucharWarren, Klobuchar call on FTC to curtail use of non-compete clauses Republican strategist predicts his 2020 Dem primary final four Chicago mayor race mirrors national push for more women in office, says columnist MORE (D-Minn.) and Cory BookerCory Anthony BookerWarren, Klobuchar call on FTC to curtail use of non-compete clauses Citizens lose when partisans play politics with the federal judiciary Booker opens up about relationship with Rosario Dawson MORE (D-N.J.).