By Joe McDonald, Paul Wiseman and Jill ColvinAP Business WritersWASHINGTON — President Donald Trump declared Friday that he had "hereby ordered" American companies "to immediately start looking" for alternatives to operating in China, hours after Beijing announced new trade sanctions on U.S. products.But as markets in the U.S., Asia and Europe tumbled, the White House offered no further details or explanation of Trump's intentions.Instead, the president tweeted that he would be "responding to China's Tariffs this afternoon.Read more on NewsOK.com