Sen Mike Lee accuses Chicago mayor - who called Trump a 'monster' - of 'bragging about' violating the law

Johnson accused the president of "animus towards women, people of color, [and] working people."

"We have always known who he has been," he declared. "This is not a surprise. He's a monster, period. We have the most diverse administration in the history of Chicago, and he is threatened by that."

Fox News Digital reached out to the White House for comment but did not receive a response by the time of publication. 

The mayor's fiery comments come in the context of the Justice Department launching a probe into whether Chicago is engaging in race-based discrimination.

The letter points to comments the mayor made while speaking to Dr. Byron T. Brazier, pastor of the Apostolic Church of God.

Dhillon's message to the mayor notes that "we have not reached any conclusions about the subject matter of the investigation."

The mayor's press office also did not respond to Fox News Digital's comment request by the time of publication.