Colombian President Gustavo Petro said Monday he would "take up arms" against the U.S. if it attacks his country, following U.S. military action in Venezuela and the capture and arrest of President Nicolás Maduro.

Petro, a former member of the leftist M-19 guerrilla movement that demobilized in the early 1990s, made the remarks in a linked to drug trafficking.

"I am not illegitimate, nor am I a narco," he wrote. "I only have as assets my family home that I still pay for with my salary. My bank statements have been published. No one could say that I have spent more than my salary. I am not greedy."

Petro's comments came after Trump spoke to reporters aboard Air Force One on Sunday.

He warned that Colombia is "very sick too" and is "run by a sick man who likes making cocaine and selling it to the United States, and he’s not going to be doing it very long."

Trump has labeled Petro an "illegal drug dealer" in the past and later doubled down, calling the Colombian president a "lunatic."

Petro has been one of Trump’s fiercest critics in the region, condemning U.S. strikes on what he described as suspected drug-smuggling vessels in the Caribbean. Petro previously claimed many of those killed in the strikes were "poor fishermen" forced into the drug trade out of necessity.

In November, he called Trump a "barbarian" and briefly halted intelligence sharing with Washington.

Colombia’s narcotics trade is largely controlled by illegal armed groups, including the Gulf Clan, the ELN and dissident FARC factions.

Petro warned that U.S. bombing would radicalize rural communities, saying campesinos would become "thousands of guerrillas in the mountains."

As previously reported by Fox News Digital, the Trump administration revoked the Colombian president’s visa over alleged "reckless and incendiary actions."

"Earlier today, Colombian president @petrogustavo stood on a NYC street and urged U.S. soldiers to disobey orders and incite violence," read a post on the U.S. State Department's X account at the time. "We will revoke Petro’s visa due to his reckless and incendiary actions."

Fox News Digital has reached out to the White House for comment.