Trump-Xi reunion comes with unfinished business — and a bigger battle looming

Chinese President Xi Jinping arrived in Washington Wednesday evening for a summit with President Donald Trump, four months after the two leaders reached a sweeping agreement that included Chinese commitments on rare earths, agricultural purchases, trade and investment.

Trump hailed that agreement as a breakthrough for American farmers, manufacturers and workers. But the latest talks come amid uneven progress on commitments involving rare-earth minerals, agricultural and commercial purchases...