Last modified on Sun 7 Feb 2021 06.48 EST
For the former prime minister Theresa May, one of the most pressing matters she confronted during her encounter with Donald Trump a few days after his inauguration went beyond mere diplomacy.
May had travelled to Washington in 2017 with the intention of persuading the new US president to make a supportive statement about Nato. Little did she expect that she would be calling her husband, Philip, to warn him that images of the US president of holding her hand as they walked through the White House would soon be flashing around the world.
With Trump out of power, those who had ringside seats during four years of dangerous and often chaotic foreign policy are now describing their – often bruising – encounters in a major new documentary series.