If mass deportation impacts businesses, say construction, why don’t the companies just hire American workers?

This is a question I’m genuinely curious about.

If there is a company that builds, say new construction homes, but maybe half their workers were deported, why wouldn’t the company just hire American workers to backfill those positions?

I don’t personally know any illegal immigrants but I assume that the ones that work in construction often get paid in cash. but I’m also assuming they get paid pretty, unless I’m wrong about that.

But why not just pay that same amount to somebody that is in America?