Experts believe businesses in the media, health care and manufacturing sectors will get especially hard-hit, writes The Post Editorial Board. Getty Images

If the Trump administration is really dumping the entire grace period for legal immigrants to renew work permits , the Department of Homeland Security needs to rethink a move that means utter, needless chaos.

US Citizenship and Immigration Services only lets you start to renew a work permit six months before it expires — but routinely takes much longer than six months to finish its processing.

It’s one thing if DHS were simply tossing out a Biden-era rule that extended the grace period from 180 days to 540 day: That would still give you six months after expiration for USCIS to get its job done.

But DHS is tossing any grace perio

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