The EU's Chief Brexit negotiator has urged the UK for more clarity on where it stands on key issues such as citizens rights and the divorce bill. <br/><br/>Michel Barnier said progress had been made in talks with David Davis in areas where the UK position was clear. But there are still differences on how citizens' residence rights will be guaranteed and how it will maintain the common travel area in Ireland.<br/><br/>He was speaking at a media conference at the end of the second week of talks.