By Jeff Mason, Bart H. Meijer and David Brunnstrom WASHINGTON/BRUSSELS (Reuters) -U.S. President Donald Trump opened a new phase on Monday in the trade war he launched this year, telling partners, from powerhouse suppliers such as Japan and South Korea to minor players,

President Donald Trump on Monday informed seven nations, including Japan and South Korea, that new tariffs of at least 25% will be imposed starting Aug. 1 on most goods sent to the United States.