Powerful, obscure law is basis for Trump ‘order’ on trade

By ZEKE MILLER
BIARRITZ, France — President Donald Trump is threatening to use the emergency authority granted by a powerful but obscure federal law to make good on his tweeted “order” to U.S. businesses to cut ties in China amid a spiraling trade war between the two nations.
China’s announcement Friday that it was raising tariffs on $75 billion in U.S. imports sent Trump into a rage and White House aides scrambling for a response.
Trump fired off on Twitter, declaring Am