How would Brexit impact Northern Ireland's border with Ireland?

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Listeners have a lot of questions about the European Union and the UK's referendum on whether to leave or remain. PM asked the BBC's Europe correspondent Chris Morris and Assistant Political Editor Norman Smith to answer a selection. Norman Smith answers listener, Nicola Ashdown's, question: What would be the implications for Northern Ireland if the UK leaves the EU? Would border controls between Northern Ireland and Eire come back into effect? (Image: Road sign at the Irish border. Credit: Getty images.)