President Trump hasn’t been saving jobs in the last few weeks, focusing his energy (and Twitter feed) on how to close the borders to immigrants instead.

When he gets back to it, he might spend less time on the workers putting together air-conditioning units in Indiana and more — a lot more — on the maids and janitors who clean Trump golf resorts and hotels.

This is not to accuse the president of being hypocritical by skewering companies that move production overseas while, say, selling Trump merchandise made in Bangladesh, or loudly championing the cause of the working man while refusing to recognize the rights of workers at his branded properties.

Rather, it is to argue that by obsessing over how the manufacturing jobs of the 1970s were lost to globalization, Mr. Trump is missing a more critical workplace transformation: the vast outsourcing of many tasks — including running the cafeteria, building maintenance and security — to low-margin, low-wage subcontractors within the United States.