Attorneys general oversee the enforcement of federal laws and executive orders in their state. If they don’t enforce them, the government can sue them; but attorneys general can also sue the government over the constitutionality of laws or executive orders. Right now, Republican attorneys general are suing the federal government over DACA and the Affordable Care Act. These lawsuits are a backdoor way to repeal federal laws. But even if the court doesn’t ultimately repeal a law, it could delay (enjoin) it until a verdict is reached. For the ACA, this means millions could lose their health insurance while the case is pending; and if the court sides with the Republican attorneys general, the ACA gets repealed.