The first such march was held the day after President Donald Trump's inauguration in 2017. Thousands of people were expected to turn out in hundreds of cities across the nation on Saturday.

The law bans nearly all abortions, and doctors providing pregnancy care are hoping for more clarity soon, as legal challenges continue.

"Today, abortion remains safe and legal in South Carolina, and politicians' plan to restrict access to health care has failed," the region's Planned Parenthood president said following the decision.

Colorado's Proposition 115 could shut down one of the few clinics nationwide that specializes in later abortion.