Trump: Baltimore mayor 'a joke'
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Republican presidential nominee Donald TrumpDonald John TrumpSunday shows preview: Shutdown negotiations continue after White House immigration proposal Rove warns Senate GOP: Don't put only focus on base Ann Coulter blasts Trump shutdown compromise: ‘We voted for Trump and got Jeb!’ MORE on Sunday slammed Baltimore Mayor Stephanie Rawlings-Blake, calling her "a joke."

"I see where Mayor Stephanie Rawlings-Blake of Baltimore is pushing Crooked hard," he tweeted Sunday, a reference to his Democratic opponent, Hillary ClintonHillary Diane Rodham ClintonConservatives pound BuzzFeed, media over Cohen report BuzzFeed story has more to say about media than the president Trump knocks BuzzFeed over Cohen report, points to Russia dossier MORE.

"Look at the job she has done in Baltimore. She is a joke!"

The mayor earlier Sunday had defended Clinton and attacked Trump.

On Sunday, she shot back at the Republican nominee after his tweet. 

"Girl bye, if he can't take criticism from "a joke", what's he gonna do when somebody really comes for him? #notready" she tweeted.