India, Jan. 4 -- US President Donald Trump issued a blunt warning to Colombian President Gustavo Petro, telling him to "watch his a**," even as Venezuelan President Nicolas Maduro was transferred to a prison in New York nearly a day after Washington launched Operation Absolute Resolve in Venezuela.

Speaking to reporters, Trump accused Petro of allowing cocaine production that fuels drug trafficking into the United States.

"He's making cocaine and they're sending it into the United States, so he does have to watch his a**," Trump said.

The Colombian leader has repeatedly criticised US military deployments in the Caribbean aimed at intercepting alleged drug-trafficking vessels.

Trump recently escalated rhetoric further, saying he would ...