Theresa May threatens US with trade war over Bombardier row

Theresa May has threatened a trade war with the US after it slapped punitive tariffs on British-built aircraft, casting doubt on a key plank of her Brexit strategy.
Read more: http://www.telegraph.co.uk/news/2017/09/27/theresa-may-threatens-us-withtrade-war-bombardier-row/?source=Snapzu