How is legislation like this any different than pro-union legislation? It benefits workers in a particular industry the expense of consumers who bear higher costs.
1) the GOP has ridiculed and fought and destroyed unions since years to a point of no-return.
2) it is not benefiting anyone, it is mostly just cost-shifting.
Unions died out on their own. Much like coal jobs. There is a reason like 70% of union americans work for the government. That number as late as 1999 was only like 30%
Ironically, tariffs like this may actually raise union rates because they will bring back american industry where unionism is common.