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

President TrumpDonald John TrumpRepublicans consider skipping witnesses in Trump impeachment trial Bombshell Afghanistan report bolsters calls for end to 'forever wars' Lawmakers dismiss Chinese retaliatory threat to US tech 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 WarrenTrump trade deal likely to sow division in Democratic presidential field Buttigieg says he doubts consulting work for insurer led to layoffs Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles 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 KlobucharTrump trade deal likely to sow division in Democratic presidential field Biden narrowly ahead in Iowa as Sanders surges, Warren drops: poll Overnight Defense: Dems unveil impeachment articles against Trump | Saudi military flight students grounded after shooting | Defense bill takes heat from progressives | Pentagon watchdog to probe use of personnel on border 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'RourkeBeto O'RourkeButtigieg picks up third congressional endorsement from New York lawmaker Klobuchar hires staff in Nevada Deval Patrick enters 2020 race MORE (D-Texas), who is mulling a 2020 bid, will hold a counter-rally at the same time.