Washington slapped unprecedented sanctions on Colombia’s leftist president, his wife, son and a top aide Friday, accusing them of enabling drug cartels — and rocking a decades-old alliance.

The US Treasury blacklisted Gustavo Petro, first lady Veronica Alcocer, his eldest son Nicolas, and Interior Minister Armando Benedetti, banning them from travel to the United States and freezing any US assets they hold.

It was an unusual move. The US sanctions list is usually reserved for drug kingpins, terror operatives and dictators involved in widespread human rights abuses.

The rupture caps months of personal friction between President Donald Trump and Petro over US deportations and strikes on suspected drug boats off the coast of South America.

“President Petro has allowed drug cartels to flou

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