Japan’s economy risks taking another hit if US President Donald Trump slaps fresh tariffs on China, sparking a renewed US-China trade war, according the government’s chief economist.

As President Donald Trump threatens to impose his first tranche of tariffs on the world Saturday, Chinese manufacturers are bracing for impact.

Trump has threatened a 10% levy from 1 February - but his campaign included 60% tariffs against Chinese imports.

Donald Trump has wasted no time in making sweeping changes to US economic policy. On his first day back in the White House, on January 20, he announced a series of executive orders and threats to impose tariffs on key trading partners by February 1.