International law hasn't stopped the US before. So why bother? We can just deport these illegal citizens to the place that best matches their heritage. Problem solved.

And in the US, jaywalking is a crime. A crime is a crime, which makes jaywalking a crime all the same. If they decided to jaywalk, then they deserve to be deported for their criminal actions.

For reference: Crossing the boarder illegally is a misdemeanor just like jaywalking.