Who belongs?: The global battle over citizenship

The US Supreme Court birthright citizenship decision is not an isolated legal event. Increasingly, around the globe, countries are struggling to redefine who belongs within their borders, from anti-immigrant protests in South Africa to Spain's decision to regularize large numbers of undocumented migrants. Francois Crepeau, a professor emeritus of public international law at McGill University in Montreal, speaks with The World's Host Marco Werman about the political dynamics behind the different approaches.