Here are some things to know about Trump’s actions, the counters from U.S. trading partners and what it means for American consumers.

U.S. President Donald Trump said on Sunday that although Britain was "out of line" when it came to trade he thought it may be able to avoid tariffs, adding of the imbalance: "I think that one can be worked out".

Shares in Asian manufacturers tumbled on concern that tariffs will hurt trade in North America and disrupt global supply chains.

China has reiterated its threat to take “necessary countermeasures" following Trump’s decision to impose 10% tariffs on China.