Immigrants place an extra burden on the welfare system. Immigrants generate more taxes for welfare than they use up. Immigrants put a strain on already overstrained resources. Immigrants create new markets. Immigrants import crime.
Immigrants are, in the vast majority, law-abiding.
Immigrants bring strange customs and practices with them. Strange customs and practices are as American as apple pie. Immigrants create ghettos. Like native-born Americans, they want to live in communities of their choice. Immigrants are poor.