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The Taft-Hartley Act gives presidents ability to intervene in damaging work stoppages such as the one engulfing West Coast ports.
Draymen say they could be forced out of business by huge demurrage and detention bills.
Move comes as ILWU, PMA talks enter 10th month.
CN announced the ratification of a four year agreement with the Teamsters-lead union.
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.