Gustavo Petro tells the BBC's Ione Wells that the United States is treating other nations as part of a US "empire", after Trump threatened Colombia with military action.

Colombian President Gustavo Petro called for a nationwide mobilization and urged citizens to "defend sovereignty in light of Donald Trump's threats.

The US president threatened his counterpart over alleged drug trafficking after US forces ousted Nicolas Maduro. On Wednesday, he had a phone call with the Colombian president and…