What could happen to illegal immigrants married to US citizens if new immigration laws are enacted?

I would advise that they return home and attempt to seek Immigration to the US through the legal alien immigration office and allow their alien ambassador to get them an alien American greencard.

The non citizen spouse will be allowed to file for an adjustment of status. If it is not granted the non citizen spouse will still be allowed to use the established appeal process, he or she WILL NOT be automatically deported.