Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) responded to President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate 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.

ADVERTISEMENT

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

What’s crazy is that we have 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. Say you're in: https://t.co/rxqbjJJKv3 https://t.co/HoJG0Rlwq1 — Bernie Sanders (@BernieSanders) February 20, 2019

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 Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.), Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.).