By Mei Mei Chu, Antoni Slodkowski and Trevor Hunnicutt
BEIJING, May 12 (Reuters) - A year ago, U.S. President Donald Trump predicted that towering trade tariffs would bring America's main economic rival to heel.
He heads to China this week with that ambition blunted by court rulings, narrowing his goals to a few deals on beans, beef and Boeing jets, and enlisting China's help to resolve his unpopular Iran war, political analysts say.