The U.S. next week will ask that the World Trade Organization establish a dispute settlement panel in its pending challenge of the manner in which China administers tariff-rate quotas for rice, wheat and corn, according to a schedule of a Dispute Settlement Body meeting set for Aug. 31. The dispute was filed by the Obama administration in December 2016, and until now had been untouched by the Trump administration. China is allowed to reject the first request for a dispute...