The US President has cranked up the pressure on trading partners, firing off letters to heads of several countries, informing them of their new tariff rate.

President Donald Trump cranked up the pressure on two of America’s key trading partners, Japan and South Korea, firing off letters Monday to the heads of their countries that informed them of their new tariff rate.

President Trump initiated a new phase in the trade war by informing trade partners, including Japan and South Korea, of increased U.S. tariffs starting August 1. While hinting at further negotiations,