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 spent the weekend excoriating 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.), inflaming racial tensions once again by taking aim at a top African American Democratic lawmaker and parts of the majority-black district he represents.

The president on Saturday and Sunday sent more than a dozen tweets assailing Cummings and the city of Baltimore. The weekend started with Trump describing the country's 30th-largest city and surrounding areas as a "very dangerous & filthy place" where "no human being would want to live," and it ended with Trump calling Cummings — the son of sharecroppers in South Carolina — a "racist."

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It marked the second time in three weeks that Trump targeted a prominent minority Democratic lawmaker and in many ways mirrored how his attacks on Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn 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 McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Minn.) and Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.) played out.

In targeting Cummings, the president went after a well-respected, 13-term congressman who leads one of the committees leading investigations into his administration.

Trump launched the first of what would be several broadsides against Cummings on Saturday morning. The president may have been agitated by Cummings's resolve to pursue oversight or set off by a Fox News segment that aired Saturday morning that included footage of Cummings's district, which encompasses parts of the city of Baltimore as well as suburban and rural areas.

Trump decried Cummings as a "brutal bully" for his fierce critiques of conditions at the southern border and suggested Baltimore "is FAR WORSE and more dangerous. 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," Trump continued. "Cumming 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."

With Cummings as chairman, the House Oversight and Reform Committee has voted to hold Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE and Commerce Secretary Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE in contempt for defying subpoenas; heard testimony from former Trump attorney Michael Cohen Michael Dean CohenJudge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr MORE; held a hearing on conditions at the southern border; and authorized a subpoena for official communications from senior White House advisers Ivanka Trump Ivana (Ivanka) Marie TrumpThe Hill's 12:30 Report: Trump stokes fears over November election outcome Special counsel investigating DeVos for potential Hatch Act violation: report Trump, Biden vie for Minnesota MORE and Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE.

In a press conference after former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's testimony, Cummings pledged that he could continue to hold Trump accountable despite resistance from the administration, arguing the future of the government was at stake.

"We refuse to betray generations yet unborn and the American people," Cummings said alongside Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 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 Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) and other committee chairmen. "We’re not going to betray them."

"We’re going to do our part to make sure that we have a democracy that’s intact," he added.

Trump, who spent part of his weekend at his Virginia golf club, fired back at Cummings with a barrage of tweets chastising him and the city of Baltimore.

"Why is so much money sent to the Elijah Cummings district when it is considered the worst run and most dangerous anywhere in the United States," Trump tweeted Saturday morning. "No human being would want to live there."

The president quote-tweeted multiple videos that purported to show abandoned homes in Cummings's district used as dumping grounds for trash. In each case, Trump blamed the congressman for the images.

In one case, he retweeted far-right British commentator Katie Hopkins, who described Baltimore as a "proper sh*thole."

"So sad that Elijah Cummings has been able to do so little for the people of Baltimore," Trump tweeted Saturday. "Statistically, Baltimore ranks last in almost every major category. Cummings has done nothing but milk Baltimore dry, but the public is getting wise to the bad job that he is doing!"

Cummings responded to Trump's initial wave of insults on Saturday morning by rejecting the criticisms and urging the president to work on a bipartisan basis.

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

Democrats rallied around Cummings to denounce the tweets as racist and condemn Trump's open disdain for a major U.S. city.

"It's unbelievable that we have a president of the United States who attacks American cities, who attacks Americans, who attacks somebody who is a friend of mine," Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) said Sunday on CNN.

House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) called the president's tweet suggesting money was being stolen from Cummings's district "disgusting and racist."

Pelosi rejected Trump's tweets as "racist" and hailed Cummings as "a champion in the Congress and the country for civil rights and economic justice, a beloved leader in Baltimore, and deeply valued colleague."

But Trump and his allies were quick to accuse Democrats of overusing allegations of racism and suggested criticism of Cummings and his district was fair.

Acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE said on "Face the Nation" that he understood why some might view the tweets as racist, "but that doesn't mean it's racist."

"The President is pushing back against what he sees as wrong," Mulvaney said. "It's how he's done in the past and he'll continue to do in the future."

Trump was more forceful in his rebuttal to charges of racism.

"There is nothing racist in stating plainly what most people already know, that Elijah Cummings has done a terrible job for the people of his district, and of Baltimore itself," Trump tweeted Sunday. "Dems always play the race card when they are unable to win with facts."

Within an hour, Trump sent a follow-up tweet calling Cummings a racist and deriding his "radical 'oversight'" as "a joke."

The sequence of events played out in nearly identical fashion to the president's attacks on the self-styled "squad" of Ocasio-Cortez, Omar, Tlaib and Pressley.

Two weeks ago, Trump set off a firestorm by tweeting that the four minority Democrats should "go back" to their countries and "help fix the totally broken crime infested places from which they came."

All four are U.S. citizens, and only Omar, a Somali refugee, was not born in the country. The House later voted to condemn Trump's "racist comments," while the president tweeted that he does not have a "racist bone" in his body.

But Trump's attack steadily escalated, accusing the four congresswomen of hating the country. It culminated in incendiary fashion with a rally crowd chanting "send her back" about Omar and with Trump calling the group "a very Racist group of troublemakers who are young, inexperienced, and not very smart."

While Trump made clear he views tying the broader Democratic Party to four of its most progressive lawmakers as politically advantageous, it's less clear how the president will benefit from picking on a well-liked and more moderate representative such as Cummings, who has spoken of his friendship with close Trump ally Rep. Mark Meadows Mark Randall MeadowsAnxious Democrats amp up pressure for vote on COVID-19 aid Pelosi hopeful COVID-19 relief talks resume 'soon' The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (R-N.C.).

The president suggested that his support won't suffer for the attacks and that it might even receive a boost. He relied, as he often does, on statistics showing African American unemployment declining under his administration.

In one instance, he closed a tweet with the hashtag #BlacksForTrump2020, and in another, he referenced opportunity zones developed through tax reform legislation passed in 2017.

"Waiting for Nancy and Elijah to say, 'Thank you, Mr. President!'" Trump tweeted Sunday.