The US has pledged $1bn (£740m) to Colombia hours after the country's new right-wing populist president was sworn in. Abelardo de la Espriella, an admirer of Donald Trump who echoed many of the US president's policies on the campaign trail, used his maiden speech to promise an "all-out war" on drug cartels. A lawyer and businessman by trade, de la Espriella has cast himself as maverick outsider, vowing to combat crime with an "iron fist". Membership of armed groups has expanded in recent years, and a brutal conflict between rival rebel groups along the Colombia-Venezuela border displaced tens of thousands of people last year. Colombia - and Petro's policies - have been among targets Trump has repeatedly blamed for the flow of drugs and illegal migrants into the US.