President Trump has ripped Rep. Elijah Cummings, tweeting that the congressman was “a brutal bully” who unfairly attacked border agents.

“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 posted.

“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,” he continued. “No human being would want to live there. Where is all this money going? How much is stolen? Investigate this corrupt mess immediately!”

Like most Democrats, Cummings has been a harsh critic of the president’s immigration policies.

The latest Trump outburst appears to be related to the congressman’s tough questions for acting Homeland Security chief Kevin McAleenan during a House Oversight Committee earlier this month.

Cummings took particular offense after McAleenan said he was doing his “level best” to handle the ongoing crisis at the U.S. border.

“What does that mean? What does that mean when a child is sitting in their own feces, can’t take a shower? Come on man,” Cummings said. “What’s that about? None of us would have our children in that position. They are human beings.”