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Senator seeks to change the "build America" requirement for Jones Act ships.
Agency is also planning a February discussion of environmental issues at ports.
ILWU says it may take between eight to 10 days to unload a ship because of limits on longshore hiring.
Maersk Line CEO Soren Skou told American Shipper container lines need to adapt to permanent overcapacity, and cited Maersk's network management as the primary driver of bumper profits in recent years.
Congress passed a 7-day extension to keep the department running while negotiations over immigration dispute continue.
Texas’s exports reached $289 billion and California topped $174.1 billion in export value for 2014.