Donald Trump: 'Waterboarding absolutely works'

In Donald Trump's first broadcast interview as US president, he defended his call to resume using waterboarding - a torture technique - to interrogate terror suspects.

"When Isis [so-called Islamic State] is doing things that nobody has ever heard of since medieval times, would I feel strongly about waterboarding? As far as I'm concerned, we have to fight fire with fire," he told ABC News.