Trump's immigration policy and executive orders
...Democrats tend to see immigration as a voter registration opportunity rather than a dilution of the labor pool that hurts American workers. It is an area where Trump has struck a real cord with some voters.
One area in which Trump promised to take extensive and quick executive action is immigration, with a pledge to "change immigration rules to give unemployed Americans an opportunity to fill good-paying jobs."
What Trump meant is that there are parts of U.S. immigration policy — significant parts — that could be changed through executive action, or regulation, or simply enforcing existing law. For example, there are programs for the admission of foreign workers — the various alphabet programs like H-1B visas, EB-2 and EB-3 green cards, etc. — that have weak or nonexistent requirements that businesses hire, or try to hire, an American first. It's a concept that has huge public support, but one the government does not enforce. A President Trump could change that, on his own authority.
The result could be a decided shift toward government enforcing laws directing that jobs go to Americans before foreign workers.