WASHINGTON (AP) — State visits usually occur when two countries are on warm terms, but U. S. President Donald Trump is hosting Chinese leader Xi Jinping in Washington this week as their economic and tech competition is only escalating, especially through an artificial intelligence race. Neither expects any grand bargain, but the leaders are expected to play nice in their third meeting since Trump returned to the White House to try to steady fragile ties. That is despite the world’s two the...