Trump on Saturday morning attacked Cummings, saying he had failed his district, shortly after a Fox News segment showed piles of trash in Baltimore. Cummings, a vocal Trump critic who chairs the House Oversight Committee, has over the last two weeks both authorized subpoenas for senior White House staffers’ communications and ripped into acting Homeland Security chief Kevin McAleenan over the conditions of the government camps for migrants at the southern border.

Trump called Cummings “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.

“Cumming [sic] District is a disgusting, rat and rodent-infested mess,” he added. “If he spent more time in Baltimore, maybe he could help clean up this very dangerous & filthy place.”

According to Nate Silver of FiveThirtyEight, Cummings’s Seventh District, which he has represented since 1996 and is over 50 percent African-American, has the second-highest average income of any majority-black district in the country. It covers parts of downtown Baltimore and the surrounding suburbs and includes Johns Hopkins University and the Inner Harbor, a major tourist attraction.