The law, which is effective immediately, comes after Reynolds ordered a special legislative session last week with the sole purpose of restricting the procedure in the state. But it is already facing a legal challenge after a group of abortion providers in the state filed a suit to try and stop the law.

The bill, which passed the state's Republican-controlled legislature earlier this week, prohibits physicians from providing most abortions after early cardiac activity can be detected in a fetus or embryo, commonly as early as six weeks into pregnancy, before many women know they are pregnant.