If he applies tariffs from certain countries like China, Mexico and Canada, it will force businesses to move back to America especially those companies who have government contracts. It has been suggested that he wants 10%, I don't know if that is enough to make a major dent, but it would make a difference. I have no doubt that Trump will use every bit of leverage to ensure jobs move back to America.
I believe in free trade and minimal government intervention, but there is a clear imbalance of jobs leaving to China and other nations who are artificially subsidising industries and not treating the U.S in the same manner they are being treated, a la free market access. In turn, countries like China are even building military threats closer to American allies, all on the backs of taxes they generate from U.S businesses there.
Something has to give to correct this, appears Trump is going hard to get jobs back. Once he's in office I am certain this will be his main day to day objective, to rebuild the U.S economy one job at a time until there is a much broader tax base and revenue source than is currently in place. If he does that and decreases government slush programs and programs of perpetual dependence, America will be the place to be in 2017!