I haven't seen a white man with a roofing hammer in his hand around here for years now and same goes for concrete, masonry and landscaping. And the only reason we're still working in electrical, plumbing and HVAC is because you got to be licenced to pull wire, lay pipe and pump Freon.
We just lost a chicken pant here that employed over 400 people, mostly Hispanic. Said company employees over 10,000 corporate wide. They cited the equipment as too old to be updated, but their decision could have been influenced by the promises our county Sheriff has been making for years now about "sending them all back home". He's backtracking somewhat now, as that community is decimated and all those tax dollars the chicken factory had contributed are gone.
So, yes I do honestly believe my own anecdotal evidence, especially when the the vast majority of economists, both professionals and scholars, recognize and understand how important immigrant labor is to our economy.
As far as tariffs: If your supplies and overhead cost more, then charge more. It's Capitalism 101.