Biden ignored them. Trump has had some success in securing the border by enforcing them.

As for employing foreign workers, the law has a very robust and often used provision which allows Mexican workers to come as guests, work for a period of time, and then return (all paid for by the employer). Guest worker programs are quite common across the globe. Western Europeans rely on guest workers for seasonal help from Eastern European countries for seasonal work in agriculture, for example.

It shouldn’t be a partisan issue to just follow and obey the laws we have on the books.