Paul Kelly speaks to political editor Tom McIlroy about his new book on the turbulent era of the Liberal party under prime ministers Tony Abbott, Malcolm Turnbull and Scott Morrison. In The Twilight of Exceptionalism, Kelly writes about how the Liberal leadership changed hands from a conservative, to a progressive and then a transactional centrist. The Australian’s editor at large argues that this period demonstrated the party was fractured over its values and confused about its identity in a changing world