1) We will tariff the Chinese to make it unprofitable to sell to America anything built using anything other than our self-imposed regulations.

2) When more American steel plants etc are built, assuming investors even believe the tariffs will exist through enough administration to make it profitable, they magically will somehow be safer than working in the other industries these workers were pulled from, and magically not continue to be one of the more dangerous occupations in the USA that for mysterious reasons we want more people risking their hides in.

Reality:

1) Chinese do the same thing as always, and sell to the other 95% of the world, with no labor condition changes for the chinese.

2) More Americans get their arms turned into molten lava instead of Chinese (see recent Clairton plant explosion, yay for building more of that?). So labor conditions degrade for Americans.

3) Other Chinese figure out how to game the system enough to pretend they've followed the same rules, because lets be real, "the king is far away and the mountains are large."

4) The few Chinese not manufacturing for the other 95% of earth and haven't figured out how to game the system, are fired and work at the next even shittier job they passed on the way to the steel mill.