There are real economic problems, and the press have been quite effective at blaming them on immigration when really they're more due to inequality.
> Trump succeeds and does a good job
Succeeds for whom? Different people want very different things, that's where politics comes from in the first place. What would "success" look like? How much global warming does it include?
For some Americans, the executive order banning entry for a list of nationalities means that their spouses can never leave the country again and are at greatly increased risk of being deported.
(There's a similar argument happening in the UK where "success" for some people means unemployment for others, or even being obliged to leave the country)