They didn't say "illegal" in that poster though. They didn't even say "immigrants". They just said "deportations".

They want to kick out anyone who doesn't fit into their anglo-saxon, straight, evangelical, natural born ideal. Immigrants? LGBTQ people? Brown-skinned people? Non-evangelical Christians (including Catholics, Jews, atheists, liberal Protestants, etc)? All would be gone if some of these people had their way.

The economy would completely collapse in that case. But when have they ever let reality or common sense get in the way of their xenophobic ideology.