The Brief

The Interstate 5 corridor between Orange and San Diego counties has become the unlikely flashpoint in a fresh online feud between California Gov. Gavin Newsom and the Trump administration, all over a splashy U.S. Marine Corps celebration.

The Marines are gearing up for their 250th birthday Saturday with a high-octane amphibious demonstration at Camp Pendleton's Red Beach, featuring amphibious vehicles storming the surf, aircraft buzzing overhead, Navy ships offshore and live-fire exercises.

The event, expected to draw 15,000 Marines, sailors, veterans and families, will include speeches from Vice President J.D. Vance — a Marine veteran — and Defense Secretary Pete Hegseth.

But what started as a salute to military heritage quickly devolved into partisan sniping on social media

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