What is a National Security Strategy?

This week, Donald Trump described Europe as ‘weak’ and ‘decaying’ and warned of ‘civilisational collapse’ on the continent due to immigration. His administration also published its blueprint for national security, which suggests that democracy might not be as important to the Trump White House as it has been for previous administrations. Jonathan Freedland speaks to the US military scholar Joseph Stieb about the Trump administration’s national security strategy