First off: technically, almost everyone opposes illegal immigration—the issue is whether it should be reduced by deporting undocumented immigrants, or by changing the laws to legalize more of them. (The exceptions who do support illegal immigration as-is are generally employers who exploit immigrants.)

Second: If the current law is racist, then supporting increased enforcement is racist while supporting reform (probably) isn’t. (And I would describe a law as racist if it disproportionately impacts racial minorities when alternative laws with an equivalent effect on public safety would not.)