U.S. West Coast ports that were closed to incoming cargo vessels during the holiday weekend reopened in full on Tuesday as Labor Secretary Tom Perez arrived in San Francisco seeking to broker a settlement ending months of shipping disruptions.

Perez was sent to meet with the two sides in the conflict at the behest of President Barack Obama, who has come under mounting pressure to weigh in on a labor dispute that has cascaded through the U.S. commercial supply chain and beyond.

"Secretary Perez has meetings with both parties today in San Francisco," spokeswoman Xochitl Hinojosa said in an email. "He'll urge the parties to resolve their dispute quickly at the bargaining table. We don't have any updates at this time."