Trump to 'angry' Dems: 'Loosen up and have some fun'

President TrumpDonald John TrumpJustice Department preparing for Mueller report as soon as next week: reports Smollett lawyers declare 'Empire' star innocent Pelosi asks members to support resolution against emergency declaration MORE on Monday urged Democrats to "loosen up and have some fun," criticizing the party for being "self righteous and ANGRY."

It's unclear what prompted Trump's tweet, though multiple Democrats over the weekend made clear their presidential aspirations for 2020, and called out the president in the process.

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Sen. Elizabeth WarrenElizabeth Ann WarrenCoast Guard lieutenant arrested, accused of planning domestic terrorism Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon Trump campaign fundraising on Bernie Sanders's M haul MORE (D-Mass.) officially entered the 2020 campaign on Saturday, and called Trump a "symptom of what's gone wrong in America."

In Iowa on Sunday, Warren was harsher in her criticism of Trump, suggesting that by the time of the 2020 election, he "may not even be president" or "may not even be a free person," citing the multiple investigations into those close to him.

Sen. Amy KlobucharAmy Jean KlobucharSanders on Trump insult: Crazy that president 'is a racist, a sexist, a xenophobe and a fraud' Trump revives 'Crazy Bernie' nickname one day after Sanders enters race Betting against Bernie? Dems assess the risk MORE (D-Minn.) declared her candidacy from snowy Minneapolis on Sunday. Though she did not explicitly mention Trump, she took a few veiled shots at the president. She pledged to press a number of pro-environment initiatives if elected, and vowed not to conduct "foreign policy by tweet."

After Trump tweeted that Klobuchar "looked like a Snowman" during her announcement, the senator responded by asking how Trump's hair "would fare in a blizzard?"

The president targeted Democrats repeatedly on Twitter over the last few days, chiding Warren's campaign, mocking the Green New Deal proposal backed by some party members and criticizing the party for its stance in ongoing border security funding negotiations.

Trump is set to hold his first campaign rally on Monday since last year's midterm elections. He will travel to El Paso, Texas, to speak near the border as he continues his push for a border wall.

Former Rep. Beto O'RourkeRobert (Beto) Francis O'RourkeThe Hill's 12:30 Report: Trump escalates fight with NY Times Sanders on Trump insult: Crazy that president 'is a racist, a sexist, a xenophobe and a fraud' Trump revives 'Crazy Bernie' nickname one day after Sanders enters race MORE (D-Texas), who is mulling a 2020 bid, will hold a counter-rally at the same time.