CNN political commentator and Democratic strategist David Axelrod David AxelrodThe Memo: Warning signs flash for Trump on debates GOP hunts for leverage in revived COVID-19 talks Pelosi says there shouldn't be any debates between Biden and Trump MORE slammed 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 attack 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.), arguing the president's "stream of ugly, divisive bombast" could threaten his reelection chances.

"If @realDonaldTrump loses in 2020, this will be why," Axelrod wrote Saturday. "Every, single day, he subjects the country he was elected to lead to a stream of ugly, divisive bombast. It’s exhausting. It’s destructive. It’s unworthy of a POTUS."

Axelrod added that the "rancor and chaos his daily dose of nastiness creates is a barrier to actually getting things done."

If @realDonaldTrump loses in 2020, this will be why.

Every, single day, he subjects the country he was elected to lead to a stream of ugly, divisive bombast. It’s exhausting. It’s destructive. It’s unworthy of a POTUS.

And it would only get worse.

Four more years? Of THIS? https://t.co/d5b175YYpl — David Axelrod (@davidaxelrod) July 27, 2019

And the thing about it is this: @realDonaldTrump may believe in multiplication by division but it doesn’t add up for the American people. The rancor and chaos his daily dose of nastiness creates is a barrier to actually getting things done on tangible concerns. — David Axelrod (@davidaxelrod) July 27, 2019

Axelrod was responding to a tweet by Trump on Saturday in which the president called Cummings's district a "disgusting, rat and rodent infested mess."

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Trump sought to contrast the district, which includes downtown Baltimore, with conditions at the southern border, calling it "FAR WORSE and more dangerous."

Cummings, the chair of the House Oversight and Reform Committee that has conducted probes into the administration, has called the treatment of migrant children at government facilities near the southern border “government-sponsored child abuse.”

"We have seen cases where the administration has deported parents without their children and still, to this day, have not reunited those families,” Cummings, a frequent Trump critic, said earlier this month.

Trump's comments about Cummings follow a series of attacks on a group of minority freshman congresswomen this month in which the president said they should "go back" where they came from. The House voted to condemn that remark as racist, though the president has since doubled down.