The union representing U.S. dockworkers signaled that 45,000 members will walk off the job at midnight, kicking off a massive strike likely to shut down ports across the East

With a strike deadline looming, the union for 45,000 dockworkers and the group representing East and Gulf Coast ports have exchanged wage offers, leaving a ray of hope that a deal can be reached without a major work stoppage.

U.S. Ports from Maine to Texas could shut down Tuesday if a union representing about 45,000 dockworkers carries through with a threat to strike.