U.S. President Donald Trump is threatening that he may decertify Colombia as a partner in the war against drugs unless the South American nation reverses a record surge in cocaine production. The shock rebuke for Washington's staunchest ally in Latin America came in the White House's annual designation of nations it deems major drug-producing or drug-transit zones. Colombia, the source of 90 percent of the cocaine consumed in the U.S., has long been a fixture on the list, which was unchanged from last year. (See also: Colombia defends anti-drug efforts after Trump critique | The most important trends in Colombia’s drug policy, explained)