ADVANCE FOR USE FRIDAY, AUG. 31, 2018, AT 3:01 A.M. EDT AND THEREAFTER - In this Wednesday, Aug. 22, 2018, photo ships are docked at the Port of Long Beach in Long Beach, Calif. Between them, the California ports of Los Angeles and Long Beach account for a large amount of the seaborne goods that the United States imports from China, and the prospect of a widening trade war between the global giants has port executives and longshoremen worried. (AP Photo/Marcio Jose Sanchez)