As Brexit sinks in, division remains in the United Kingdom

The United Kingdom formally left the European Union over night as Prime Minister Boris Johnson vowed to bring the country together, more than three years after voters narrowly approved Brexit. But divisions remain, and trade negotiations between the U.K. and E.U. are just beginning. Frank Langfitt, NPR's London correspondent and author of "The Shanghai Free Taxi," joins Hari Sreenivasan with more.