By ANDREW DeMILLO and GEOFF MULVIHILL
LITTLE ROCK, Ark. (AP) — Republican governors, lawmakers and attorneys general are forming a wall of opposition to President Joe Biden’s plan to require vaccinations or COVID-19 testing at all private employers of 100 workers or more. They have adopted laws to exempt employers in their state, filed lawsuits and in some cases are ensuring that workers who are fired for refusing a vaccine will have access to unemployment insurance. They question the constitutionality of the federal regulation, saying the federal workplace safety agency does not have the power to impose vaccine mandates. The Biden administration says it does.