NATO turns 70: 'It's been remarkably resilient last 20-30 years'

April 3rd 2019 marks the 70th anniversary of NATO. Set up in 1949 to counter the Soviet threat, the group of countries has become an important influence in wars and defense for years. For the 70th anniversary, NATO secretary-general, Jen Stoltenberg, addressed the US congress to discuss it's future.François Picard interviews Joachim Bitterlich, a former German ambassador to NATO to discuss its influence over the last 70 years, calls from Donald Trump for other countries to increase their spending and the future of the defense bloc.