European shares retreat as Trump's China response awaited

(Reuters) - European shares fell on Friday, with investor nerves ahead of U.S. President Donald Trump's response to China over its national security law for Hong Kong taking some of the shine off May's stock rally.The pan-European STOXX 600 index fell 1.4%, with the week's outperformers -- travel & leisure , banks and automakers -- leading the decline.Trump said he would hold a news conference on China later on Friday. Investors fear a U.S. response could further damage Sino-U.S. relations..