Delivering up-to-the minute news, analysis, interviews and explanatory journalism on logistics, supply-chain management, e-commerce and more U.S. port officials are raising warnings over new trade restrictions as American allies and pro-trade lawmakers are looking at how to limit the impact of the tariffs. Executives at ports in the Pacific Northwest and Charleston, S.C., say escalating retaliation over the Trump administration steel and aluminum levies could endanger shipping volumes and jobs, WSJ Logistics Report's Erica E. Phillips writes.