They surely won't do harm for the econ situation. He stops illegal emmigration and that won't make a big gap. We have plenty of people willing to work so I don't see it like a problem.
They cannot even harm him because he is the owner of the country but he has no authority over anyone to harm anyone. Yes, by all means, if he does something that will make the system of the country a little worse, he has the power to do so. It is absolutely good and it is also doing good work which will benefit people. America's economy is big enough so it will have to do a lot of work but it will cost the same so it will prefer to work slowly. In today's era, everyone wants to work, but the problems are enough, but they should be solved.