So, suddenly, immediately. the Orange Haired Idiot imposed a 25% increased tariff onto steel and aluminium (a word he is incapable of spelling or pronouncing properly) from China, Mexico, Canada and the EU. Two of these entities, China and the EU, are larger economies than the USA.
The apparent belief of the paleolithic throwback puppeteers who control the Maybot is that a "free" UK will be able to make its own trade agreements when it is no longer a member of the EU. Do they really believe that they have a greater chance than the EU of getting favourable agreements when they are negotiating with an economy whose GDP is more than six times as large as their own? And when its chief executive believes that he is a master at doing "deals" (and, apparently, has written a book about his abilities) but who also seems to have no concept of strategy?