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

Sen. Bernie SandersBernie SandersSanders to call on 2020 Democrats to reject money from drug, health insurance industries The hidden connection between immigration and health care: Our long-term care crisis Harris tops Biden in California 2020 poll MORE (I-Vt.) responded to President TrumpDonald John TrumpPompeo changes staff for Russia meeting after concerns raised about top negotiator's ties: report House unravels with rise of 'Les Enfants Terrible' Ben Carson: Trump is not a racist and his comments were not racist 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 WarrenHarris tops Biden in California 2020 poll The Hill's Morning Report - A raucous debate on race ends with Trump admonishment Democrats fret over Trump cash machine MORE (D-Mass.), Kamala HarrisKamala Devi HarrisHarris tops Biden in California 2020 poll The Hill's Morning Report - A raucous debate on race ends with Trump admonishment Democrats fret over Trump cash machine MORE (D-Calif.), Amy KlobucharAmy Jean KlobucharKlobuchar fundraises for McConnell challenger: 'Two Amys are better than one' The Hill's 12:30 Report: Trump digs in ahead of House vote to condemn tweet The Hill's Morning Report - Presented by JUUL Labs - House to vote to condemn Trump tweet MORE (D-Minn.) and Cory BookerCory Anthony BookerThe Hill's Morning Report - A raucous debate on race ends with Trump admonishment Lawmakers pay tribute to late Justice Stevens Schumer throws support behind bill to study reparations MORE (D-N.J.).