This is one way to get civil war, I guess. This will absolutely create an 06JAN on steroids somewhere down the road.
It's hitting all the mainstream sites now. From what's out there now, they did it while he was traveling. It was a DC FBI unit and they only informed their Miami office as it was happening, which likely means Secret Service got the same last minute notification. It might have gone differently with SS if Trump was in residence.
They were just grabbing boxes without even opening them, so it sure sounds like a raid to me. "Potential classified information". That means they'll find something, even if they call it "classified" after the fact. Absolutely a witch hunt. This will end up getting Trump sympathy from people who don't necessarily like him, but without TDS.