Trump's America First approach 'a return to the past'

Martin Jacques, the British author and academic, insists Donald Trump's America First approach is not some aberration in the country's history but a return to the past.

He argues this is why the decision to impose tariffs on a further $200 billion of China's imports, thereby disrupting the world trade system, should be seen in context.

"It has only been since the end of World War II that the US has seen itself as shaping the world through a global hegemony of alliances," said Jacques, author of When China Rules The World: The End of the Western World and the Birth of a New Global Order.