One of the more pressing concerns that a potential sponsor will have regarding signing an affidavit of support on behalf of a prospective immigrant is whether the affidavit of support covers medical and hospital bills, which we all recognize in this day and age, can be just astronomical. The issue comes down to this: the I-864 obligates the sponsor not only to support the intending immigrant at 125% of the poverty guideline level but also makes the sponsor responsible and liable to the US government for reimbursement of any "means-tested benefits" received by the immigrant. The nightmare question is what would happen if the immigrant were to run up medical bills that he/she couldn't pay? Would the sponsor have to pay? Unfortunately, the government does not explicitly answer this question but it does provide some guidance.