The US Food and Drug Administration has delayed granting full approval of Novavax’s Covid-19 vaccine despite it being on track to be cleared until Tuesday afternoon, a person familiar with the situation told CNN.

The delay dovetails with moves by Republican lawmakers in at least seven states to ban or limit mRNA vaccines. Some, according to KFF Health News, are also pressing regulators to revoke federal approval for mRNA-based COVID shots, which President Donald Trump has touted as a key first- term achievement.

The U.S. Food and Drug Administration has missed its deadline for making a decision on traditional approval for Novavax's COVID-19 vaccine, a source familiar with the matter told Reuters on Wednesday.