President Trump has had a contentious relationship with San Juan, Puerto Rico Mayor Carmen Yulin Cruz ever since the two disagreed on how Hurricane Maria relief should be handled, and their already-tense relationship just got worse.

The president wrote on Twitter Thursday that Puerto Rico will not be receiving aide “forever” and that the island was already a “disaster” before the hurricane hit. Cruz did not take kindly to these words.

Appearing on CNN, the San Juan mayor unleashed on him, calling him the “hater-in-chief” and a “big mouth.”

Watch the clip above to see Mayor Cruz’s unkind words for the president.