state nullification, by passage of laws or amendments to state constitutions
lawsuits filed by states' Attorneys General to block and overturn the bill
ousting of the traitors in November and a possibility of repealing the bill
If there are states brave enough to resist the new unconstitutional bill—and some are going so far as to promise to arrest any federal agent in the state that will try to uphold it, then the next step will probably be an attempt at withholding federal funds (they won't go military at first). The response to this must be state refusal to render taxes to the federal government—presented very carefully as "for the seniors" and "for the children", with (some of) the funds being used to pay at least the partial costs of federal programs now cut off.