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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
Agriculture Transportation Coalition urged Senate to press the FMC into taking action during a hearing Wednesday morning.
Los Angeles Mayor Eric Garcetti's office says there are "plenty of trucks and drivers."
The International Longshore and Warehouse Union said 82 percent of its members voted in favor of ratification.
Trade Promotion Authority, a bill that grants the president authority to conclude trade deals without congressional interference, moved forward in the Senate Thursday morning.
Together with Dynamex, the two units will offer final mile delivery in more than 70 markets.