Actually that is the (historical) tendency, for domestic companies to raise prices to match foreign goods with tariffs added. Just go to the store, do you really think that milk and apples still cost so much because they're stuck in some cargo ship in the middle of the Pacific 5 years later? Corporations are in the business of making money, not giving people bargains while they still go by Toyotas because they're still better quality than the gloriously low quality products we make.
Not to mention that he didn't just products made here, whatever few there are actually made here still have parts made abroad. And switching to making them here isn't exactly an overnight process.