Donald Trump has shared a tweet from the far-right commentator Katie Hopkins describing the city represented by a congressman he has repeatedly attacked as a “s***hole”.
The president followed up the retweet with another attack on Elijah Cummings, who represents Baltimore, claiming there was "nothing racist" about his attacks on the congressman.
He said: "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. Dems always play the race card when they are unable to win with facts. Shame!"
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The phrase used by Ms Hopkins is similar to one attributed to Mr Trump when he reportedly referred to immigrants coming from "s***hole countries" during a White House meeting.
Mr Trump caused outrage on Saturday when he claimed Mr Cummings represented a "rat and rodent infested" district in a series of vicious tweets.
House speaker Nancy Pelosi denounced the president's tweets and said Democrats would "all reject racist attacks against [Mr Cummings]".
Baltimore's mayor, Bernard C “Jack” Young, said it was “completely unacceptable” for Mr Trump to “denigrate a vibrant American City like Baltimore” and called the president “a disappointment… to the world.”
Mr Trump was criticised earlier this month when he retweeted a video by Ms Hopkins supporting his racist attacks on four US congresswomen.
In addition, he retweeted an attack by the far-right commentator on Sadiq Khan, the mayor of London, with a personal comment added: “With the incompetent Mayor of London, you will never have safe streets!”
On Sunday, Ms Hopkins also went after CNN host Victor Blackwell, who emotionally defended his home town in a speech that has since been shared thousands of times.
She accused the news anchor of "turning on the water-works" during his condemnation of Mr Trump's tweets.
Ms Hopkins, who once held jobs as a controversial columnist and radio host for the Daily Mail, The Sun and LBC, is a prominent supporter of jailed anti-Islam activist Tommy Robinson.
In September last year, she applied for an insolvency agreement in a last-ditch attempt to avoid bankruptcy after she lost a libel case to food writer and poverty campaigner Jack Monroe.