General John Kelly is the man they hope can bring order to Trump's office. We follow his journey from a working class Boston neighbourhood to the White House.
A decorated Marine General, an Iraq war veteran, who is adored by his troops and known for making tough decisions, General John Francis Kelly has come a long way from his beginnings born to an Irish Catholic family in the working class Brighton neighbourhood of Boston.
From his first mission delivering 10'000 tonnes of beer to troops in Vietnam to overseeing President Trump's controversial immigration policies as head of Homeland Security, he's described as being a straight talker who isn't afraid to 'speak truth to power'.
Mark Coles talks to friends and colleagues about about his distinguished career - and how he might fare in Trump's White House.