With a potential strike at ports up and down the East Coast and along the Gulf Coast set to begin after midnight Monday, logistics executives tell CNBC the remaining hours are critical in moving out as much trade as possible before a shutdown that will do serious damage to the functioning of the U.S. economy.

With a strike deadline looming, the group representing East and Gulf Coast ports is asking a federal agency to make the Longshoremen’s union come to the bargaining table to negotiate a new contract. The U.

U.S. ports from Maine to Texas could shut down if a union representing 45,000 dockworkers carries through with a threatened strike early Tuesday.