So, what now? How will president-elect Trump influence the world when in power? There are few certainties, and Trump has taken contradictory positions on many issues. But there are three points on which he has been consistent throughout his campaign and before, argues Tom Wright of the Washington think-tank Brookings Institute - and they should be cause for concern.

At home, President-elect Trump's tax policies might delight his GOP colleagues, but how will his plans to build an enormous wall and renew infrastructure at huge expense sit with the frugal Republicans? And to what extent can unified Republican government take advantage of three control of the Supreme Court? Graham Finlay of UCD, a political scientist and American, talks about Trump on the domestic political scene.