Add Venezuelan President Nicolas Maduro to the growing list of foreign leaders with whom tech billionaire Elon Musk has picked a fight.

Following the results of Venezuela’s presidential election, in which Maduro and his opponents each claimed victory, the owner of X took to the social media platform to accuse the self-proclaimed socialist leader of “major election fraud.” “Shame on Dictator Maduro,” Musk said Monday. Maduro in turn trashed Musk as “the archenemy of Venezuela’s peace.”