Actually they do, they just like to rant about it, pretending that they don't.
Remember, Mr 'Build the Wall' was busted with having illegals working at his resorts. On top of that, they had been instructed to lie about their status here when questioned by the authorities.
Plenty of other GOPer officials have likewise been caught, and not just courtesy of their gardeners and the ones redoing their homes. Plenty of domestics working in their mansions and not only are none of them from the US, they can't even speak a single word of English. So no, "Golly, I didn't know" excuses in that bundle of hypocrisy.