NI becomes big election issue in #GE2017 - @StephenNolan talks to Labour's Ken Livingstone

Here's something you don't see very often. Northern Ireland has become a big issue in the UK's General Election campaign. Labour leader Jeremy Corbyn has faced repeated questions over his position on IRA violence and past links to Sinn Fein during the Troubles. Stephen got the views of former London Mayor Ken Livingston and commentator Ruth Dudley Edwards.