Trump revives 'Crazy Bernie' nickname one day after Sanders enters race

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 on Wednesday welcomed "Crazy Bernie" Sanders to the 2020 Democratic presidential primary one day after he wished the independent Vermont senator well in his newly launched campaign.

"Crazy Bernie has just entered the race," Trump tweeted. "I wish him well!"

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

"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."

"The problem is he doesn’t know what to do about it," Trump continued. "We’re doing something very spectacular on trade. But I wish Bernie well. It will be interesting to see how he does."

Sanders fired back at Trump's tweet on Wednesday morning, saying it is "crazy" that the U.S. has "a president who is a racist, a sexist, a xenophobe and a fraud."

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

Sanders announced Tuesday morning he will run for president in 2020, four years after his insurgent primary campaign garnered significant momentum. He eventually ceded the Democratic nomination to Hillary ClintonHillary Diane Rodham ClintonTrump thanks 'vicious young Socialist Congresswomen' for his poll numbers Will Trump's racist tweets backfire? Democrats fret over Trump cash machine MORE.

Sanders joins a growing list of candidates seeking the Democratic nomination in 2020. Among those to launch a bid are Sens. Elizabeth Warren (D-Mass.), Kamala Harris (D-Calif.), Amy Klobuchar (D-Minn.) and Cory Booker (D-N.J.).

Former Vice President Joe BidenJoe BidenHouse unravels with rise of 'Les Enfants Terrible' Sanders to call on 2020 Democrats to reject money from drug, health insurance industries Harris tops Biden in California 2020 poll MORE and former Rep. Beto O'RourkeBeto O'RourkeThe Hill's 12:30 Report: Trump digs in ahead of House vote to condemn tweet Poll: Biden, Sanders and Warren lead 2020 Democrats in New Hampshire Poll: Biden leads 2020 Democrats by 13 points, followed by Sanders, Warren and Harris MORE (D-Texas) are among those who are expected to announce soon whether they will run in 2020.