Diplomacy's short-term limits and long-term necessity

At Issue this week: Canada Post workers go back on strike after the Liberals unveil a plan to save it from its ‘existential crisis.’ The Conservatives call for the public safety minister to be fired over leaked gun buyback comments. And Prime Minister Mark Carney tries to find more trade allies. Rosemary Barton hosts Chantal Hébert, Andrew Coyne and Althia Raj.