Is it illegal to threaten to call immigration on someone?

My friend applied to buy a mobile house.

The seller asked her to pay a $1500 down-payment and got copies of all her paystubs and passport, when it was time to close the deal, he backed up and told her He will not sell the house to illegals and told her not ask for the money back because he will report her to ICE and get her reported. All this is documented and recorded.

What are my friends options? We live in Missouri.