Anthony Gardner: How will Joe Biden handle foreign policy?

With Donald Trump's efforts to overturn the presidential election running out of road, attention is increasingly focused on President Elect Biden’s vision of America’s role in the world. Will he revert back to the policies and assumptions that defined the Obama years? Are there lessons to be learnt from Trump's disruption of foreign policy norms? HARDtalk’s Stephen Sackur speaks to Anthony Gardner, US ambassador to the EU under Barack Obama. What should the world expect from President Biden?