A Venezuelan politician may have ordered a plot to assassinate Florida Senator Marco Rubio last month, according to a memo disseminated to law enforcement sources from the Department of Homeland Security.

Out of precaution, Rubio has had an increased security detail since details of the threat emerged, according to the Miami Herald. He was seen with the additional security personnel on July 19 at a Senate hearing where he called Diosdado Cabello, a Venezuelan politician who reportedly runs the state security service, the “Pablo Escobar of Venezuela”.

Cabello and Rubio have had an ongoing Twitter feud over the last month, where Rubio has frequently called Cabello a drug lord and criminal, saying he will “have to face justice for [his] crimes.” Rubio has been vocal and highly critical over the crisis in Venezuela and the actions taken by the socialist government under Nicolas Maduro.