Far-left President of Colombia Gustavo Petro warned President-elect Donald Trump on Sunday that he will side with neighboring Panama “until the last consequences” should the United States take control of the Panama Canal.

Petro, a former member of the Marxist M19 guerilla terrorist organization and the first leftist president in Colombia’s history, is known for issuing wild, often outrageous rants through his personal Twitter account.

The Colombian president took to social media on Sunday afternoon to criticize Trump amid the ongoing debate regarding the Panama Canal after the U.S.