US Congress grills big tech bosses on antitrust

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America's best known companies - Facebook, Amazon, Google and Apple - have faced attacks on all sorts of fronts - whether it's over the use of personal data, stifling competition, allowing copyright infringement or paying too little tax. Now they're in Washington defending what they do in front of committees of politicians. We hear from Karen Kornbluh, director at the German Marshall Fund of the United States and former US ambassador to the OECD. We are also asking if a new dawn in learning has arrived as we meet we actor and YouTuber Oliver Thorn, who is giving away the contents of his philosophy degree for free online. Also in the programme, we speak with mayors who are defying national immigration policies around the world. We hear from mayors of Milan, Los Angeles, Freetown and Bristol who are demanding greater say in how they run their cities. Plus, we are asking, should flexible working be the default position? Presenter Jon Bithrey is joined by guests Lulu Chen in Hong Kong and Ralph Silva in Toronto. PHOTO: US Congress, Getty Images