2020 Democratic presidential candidate Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE on Saturday denounced President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's attacks on Rep. Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) and the district he represents as "racist" and "disgusting."

"Donald Trump, once again, is a racist who makes ever-more outrageous, racist remarks," the Massachusetts senator told reporters. "It is insulting, both to the congressman and to the people he represents."

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"Elijah Cummings is one of my dearest friends. He is a good man through and through, and he fights for what is just in this country," she continued. "To be attacked by a president issuing racist tweets is beyond insulting, it is disgusting."

The comments from Warren came just hours after Trump derided Cummings as a "bully" while casting the Baltimore-area district he represents as "dangerous" and "filthy."

Sen. Elizabeth Warren: "Elijah Cummings is one of my dearest friends. He is a good man through and through, and he fights for what is just in this country. To be attacked by a President issuing racist tweets is beyond insulting, it is disgusting." pic.twitter.com/UmQ3N9wnPS — The Hill (@thehill) July 28, 2019

“Cummings has been a brutal bully, shouting and screaming at the great men & women of Border Patrol about conditions at the Southern Border, when actually his Baltimore district is FAR WORSE and more dangerous,” Trump said on Twitter earlier Saturday.

“His district is considered the Worst in the USA as proven last week during a Congressional tour, the Border is clean, efficient & well run, just very crowded. Cummings' District is a disgusting, rat and rodent infested mess. If he spent more time in Baltimore, maybe he could help clean up this very dangerous & filthy place.”

The remarks prompted outrage from a chorus of Democratic lawmakers and Warren's fellow 2020 presidential candidates. Cummings, the chairman of the House Oversight and Reform Committee, used the comments to remind Trump of his role as a lawmaker.

“Mr. President, I go home to my district daily. Each morning, I wake up, and I go and fight for my neighbors," he said. "It is my constitutional duty to conduct oversight of the Executive Branch. But, it is my moral duty to fight for my constituents.”

Trump doubled down on his remarks late Saturday night and early Sunday morning, arguing that Cummings has done little for his constituents.

"The Democrats always play the Race Card, when in fact they have done so little for our Nation’s great African American people... Elijah Cummings has failed badly," Trump said on Twitter.

Cummings has repeatedly criticized the Trump administration over the last two-plus years. Trump's attacks on the congressman came weeks after Cummings said the administration's treatment of migrant children at border facilities was “government-sponsored child abuse.”