You have to remember that Trump is decades behind, there used to be lots of skilled manufacturing jobs that were well paid, secure, desirable, respected* and much better than retail or service jobs that were lost to a combination of outsourcing and automation during the deindustrialization of the late 80s and 90s. Those jobs aren't coming back in significant numbers, if at all, automation is cheaper, faster and more accurate, but unskilled work? Well, if the combination of wages & training is cheaper than making a machine...
*ETA: And as Gulliver Foyle rightly points out, unionised.