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PMA said ships will not load or unload cargo Thursday, Saturday, Sunday or Monday due to continuing ILWU slowdowns.
Port of Long Beach CEO said ports are in a "perfect position" to play this role.
Employers "hopeful that this will allow us to move toward conclusion of an agreement in the near term."
On-time performance is being hampered by congestion at West Coast ports.
DHS funding crisis means the agency will have to focus resources on border security, cargo clearance
The revised agreement would allow collaboration on congestion, transportation infrastructure needs and pollution mitigation.