President Trump lashed out at House Oversight Chairman Elijah Cummings over his criticisms of the border situation.

"Rep, Elijah 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. His district is considered the Worst in the USA," Trump said in a trio of tweets Saturday morning. "As proven last week during a Congressional tour, the Border is clean, efficient & well run, just very crowded. 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."

....As proven last week during a Congressional tour, the Border is clean, efficient & well run, just very crowded. 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 — Donald J. Trump (@realDonaldTrump) July 27, 2019

He added, "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. No human being would want to live there. Where is all this money going? How much is stolen? Investigate this corrupt mess immediately!"

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. No human being would want to live there. Where is all this money going? How much is stolen? Investigate this corrupt mess immediately! — Donald J. Trump (@realDonaldTrump) July 27, 2019

[Elijah Cummings responds to Trump's swipe at his 'rat and rodent infested' Maryland district]

Cummings, who represents the Baltimore-area 7th Congressional District, has been a harsh critic of what he argues is the Trump administration's poor treatment of migrants seeking asylum in the U.S. The House Oversight Committee chairman shouted down acting Secretary of Homeland Security Kevin McAleenan over conditions in migrant camps during a hearing on Thursday.

[ALSO READ: Maryland district Trump hate-tweeted a mix of 'The Wire' and upscale suburbia]

Last week, Cummings also gained the authority to subpoena top White House aides for their personal email and text messages, including those of Trump's daughter, Ivanka Trump, and son-in law Jared Kushner, as part of an inquiry into whether there have been any violations of federal record-keeping laws.

A watchdog group asked the Maryland attorney general earlier this month to investigate whether Cummings and his wife used a charity for improper self-enrichment.

Trump's criticism of Cummings' majority-black district comes after the president engaged in a war of words with a group of four liberal minority women lawmakers who call themselves “the squad," Democratic Reps. Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Rashida Tlaib of Michigan, and Ayanna Pressley of Massachusetts, insisting that they “go back” to their home countries, although only Omar was born outside of the United States.