>> reporter: and pitting resident against resident along cultural lines. muiretta is this week's ground zero for u.s. immigration policy. >> i don't think the scene is prepared for this. >> reporter: what's driving these two sides? murderetta resident, steve, has gone from the bus pro it test to verbal parking at the town hall and promises to keep the heat on. >> these people are probably so excited to be here, and all of a sudden they look out the windows going, oh, my gosh, what's happening? >> reporter: you were blocking their way in. >> not because of them. because of standing firm, letting the officials know, this is not the right way to handle this. >> reporter: on the other side, murrieta resident, rivera, better known for his mexican music, has suddenly become a new hero. after this protester spit in his