(Steve Helber | AP file photo) China Shipping Company and other containers are stacked at the Virginia International's terminal in Portsmouth, Va. A coalition of 161 manufacturers, farmers, retailers, natural gas and oil companies as well as other business groups, has signed a letter asking President Donald Trump to postpone all tariff rate increases on Chinese goods slated to take effect this year. The letter, dated Wednesday, Aug. 28, and organized by Americans for Free Trade Coalition, comes as tariff increases are set to take effect starting this Sunday, followed by further increases Oct. 1 and Dec. 15.