President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Monday seized on reports that Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE's (I-Vt.) campaign is more openly criticizing Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) in the Democratic presidential primary, suggesting there's a "feud brewing" between the two leading progressive candidates.

Trump appeared to be responding to a Politico report from a day earlier that the Sanders campaign was encouraging volunteers to tell voters that they're concerned Warren appeals predominantly to better-educated, wealthier voters who would already vote Democratic.

"Bernie Sander’s volunteers are trashing Elizabeth 'Pocahontus' Warren," Trump tweeted, misspelling both the Vermont senator's last name and the derisive nickname he uses to mock Warren over her past claims of Native American heritage.

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"Everybody knows her campaign is dead and want her potential voters," he continued, pivoting to an attack on Democratic candidate Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE. "Mini Mike B is also trying, but getting tiny crowds which are all leaving fast. Elizabeth is very angry at Bernie. Do I see a feud brewing?"

Warren said she was "disappointed" to hear about Sanders's campaign attacking her. Her campaign has in recent weeks attempted to portray the senator as a "unity candidate" who can bring together multiple factions of the party.

The president routinely attacks his prospective Democratic opponents, but Monday's tweet comes as his campaign has increasingly turned its attention toward Sanders, who is surging in the polls just weeks ahead of the Iowa caucuses.

Sanders has gained additional traction in the race in recent weeks, and his momentum has been amplified as he emerged as one of the sharpest critics of a U.S. military strike that killed an Iranian general and put the Middle East on edge.

An Iowa poll released last week showed Sanders running in first with support from 20 percent of likely caucusgoers, followed by Warren with 17 percent.

The president and his campaign had largely focused its firepower on former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE, who has been at or near the top of most polls since he entered the race last year.