A growing number of countries, including American allies, are striking trade deals as the Trump administration erects a higher fence around its global commerce.

Experts say the 1977 International Emergency Economic Powers Act is untested for imposing import tariffs and Trump's action will likely face swift court challenges that could set important precedents.

President Donald Trump has finally made good on a campaign promise to raise tariffs on Chinese imports – announcing on Saturday duties of 10% on all Chinese goods coming in the country as part of sweeping trade measures that also targeted Mexico and Canada.

Amid warnings of price increases, Canada moved quickly to retaliate, China said it had planned countermeasures and Mexico said it would soon unveil its response.

The Chinese Ministry of Commerce has promised to implement countermeasures and has accused the United States of violating trade rules.

China has reiterated it could take “necessary countermeasures" after U.S. President Donald Trump decided to impose a 10% tariff on China for allegedly doing too little to stem the production of precur