The five women senators in South Carolina have vowed to resist new abortion restrictions up for debate in the state’s Senate. The coalition, known as the “sister senators,” includes three Republicans, one Democrat, and one independent, and previously filibustered a near-total ban on abortion. The Republican-led Senate is expected to debate a new bill banning most abortions after an ultrasound detects cardiac activity, generally around six weeks and before most people know they are pregnant. However, the bill includes new regulations that some senators, including the sister senators, oppose. It is unclear whether the coalition can block the new version of the bill.