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

President TrumpDonald John TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border 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 ClintonGOP struggles with retirement wave Overnight Energy: Trump to revoke California's tailpipe waiver | Democrats propose bill to revoke Trump endangered species rollback | Trump officials finalize rule allowing fewer inspectors at pork plants Mark Mellman: The most important moment in history? 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 BidenJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE and former Rep. Beto O'RourkeBeto O'RourkeOvernight Energy: Top presidential candidates to skip second climate forum | Group sues for info on 'attempts to politicize' NOAA | Trump allows use of oil reserve after Saudi attacks Five top 2020 Democrats haven't committed to MSNBC climate forum Yang campaign says it received 450K entries for 'Freedom Dividend' contest MORE (D-Texas) are among those who are expected to announce soon whether they will run in 2020.