President Donald Trump ratcheted up his threats against Colombia on Wednesday, telling reporters Colombian President Gustavo Petro is “next” in the White House’s regional campaign against drug trafficking.

While initially, Trump told reporters “I haven’t really thought too much about” Petro, his comments quickly swerved into serious saber-rattling against the Colombian leader.

“Colombia is producing a lot of drugs,” Trump said. “So he better wise up or he’ll be next. He’ll be next soon. I hope he’s listening, he’s going to be next.”

Trump’s comments mark a sharp escalation of Trump’s threats against the Colombian leader. In a conversation with POLITICO earlier this week, the U.S. president floated expanding his anti-drug trafficking military operation — which have so far been focused on Venezuela — to Mexico and Colombia.

Trump has overseen a slate of strikes against alleged drug boats in the Caribbean and Pacific Ocean since September and launched a massive buildup of military power off the coast of Venezuela in an attempt to pressure the country’s president, Nicolas Maduro, to leave office.

Tensions between Trump and Petro escalated this fall amid the U.S.’s aggressive campaign against drug trafficking in the region. The Trump administration decertified Colombia as a drug control partner and revoked Petro’s visa in September, slashing aid to the country and bashing its leader as an “illegal drug dealer” the following month.

Though Trump has made clear he wants Petro out of office, he could get his wish without having to follow through on his threats. The Colombian leader is term-limited — and the country is set to head to the polls for its presidential election in May.

The Colombian embassy did not immediately respond to a request for comment.