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

Sen. Bernie SandersBernie SandersChamber of Commerce argues against Democratic proposals for financial transaction taxes Top Sanders adviser: 'He is a little bit angry' Working Families Party endorses Warren after backing Sanders in 2016 MORE (I-Vt.) responded to President TrumpDonald John TrumpTed Cruz knocks New York Times for 'stunning' correction on Kavanaugh report US service member killed in Afghanistan Pro-Trump website edited British reality star's picture to show him wearing Trump hat 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 12:30 Report: NY Times story sparks new firestorm over Kavanaugh Working Families Party endorses Warren after backing Sanders in 2016 Warren proposes new restrictions, taxes on lobbying MORE (D-Mass.), Kamala HarrisKamala Devi HarrisChamber of Commerce argues against Democratic proposals for financial transaction taxes Warren proposes new restrictions, taxes on lobbying Five top 2020 Democrats haven't committed to MSNBC climate forum MORE (D-Calif.), Amy KlobucharAmy Jean KlobucharFive top 2020 Democrats haven't committed to MSNBC climate forum Abrams helps launch initiative to train women activists, organizers The Hill's Morning Report - Trump takes 2020 roadshow to New Mexico MORE (D-Minn.) and Cory BookerCory Anthony BookerWorking Families Party endorses Warren after backing Sanders in 2016 Five top 2020 Democrats haven't committed to MSNBC climate forum Progressive tax-the-rich push gains momentum MORE (D-N.J.).