The US has imposed new tariffs on imports from seven countries, including the Philippines and Algeria, as part of Trump's drive to reduce the trade deficit and promote fair trade.

President Donald Trump is spamming world leaders with letters threatening massive tariff hikes if they don’t strike trade deals with Washington as the U.S. blows past its own 90-day deadline for deals with 90 countries.

Trump uses tariffs as a key tool to force changes to U.S. trade relationships, but his on-again-off-again approach has roiled markets and stoked uncertainty.