Chinese negotiators and their U.S. counterparts discussed technology transfers, intellectual property protections, non-tariff measures, services, agriculture, trade balance and enforcement.
Trump threatened to close border, but after outcry from lawmakers and businesses he changed course on Thursday.
Presidential candidates gather for forum in Iowa, corn cob pipe factory celebrates 150 years and Ag Economy Barometer released.
But a 'very monumental' trade agreement may be announced in a month.
Draft agreements would give Beijing until 2025 to meet commitments on commodity purchases.