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 on Monday attacked 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.) for the third straight day on Twitter, assailing the African American lawmaker and the city he represents.

"Baltimore, under the leadership of Elijah Cummings, has the worst Crime Statistics in the Nation. 25 years of all talk, no action! So tired of listening to the same old Bull," the president tweeted early in the morning.

"If the Democrats are going to defend the Radical Left 'Squad' and King Elijah’s Baltimore Fail, it will be a long road to 2020. The good news for the Dems is that they have the Fake News Media in their pocket!" he added in a second tweet.

Baltimore, under the leadership of Elijah Cummings, has the worst Crime Statistics in the Nation. 25 years of all talk, no action! So tired of listening to the same old Bull...Next, Reverend Al will show up to complain & protest. Nothing will get done for the people in need. Sad! — Donald J. Trump (@realDonaldTrump) July 29, 2019

If the Democrats are going to defend the Radical Left “Squad” and King Elijah’s Baltimore Fail, it will be a long road to 2020. The good news for the Dems is that they have the Fake News Media in their pocket! — Donald J. Trump (@realDonaldTrump) July 29, 2019

Over the weekend, Trump sent more than a dozen tweets criticizing the House Oversight and Reform Committee chairman and Baltimore.

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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."

Cummings's committee has pursued aggressive investigations into the Trump administration.

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.

Cummings responded to Trump's initial wave of insults on Saturday morning by rejecting the criticisms of Baltimore.

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

The flurry 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.