The rule keeps abortion care out of reach for many low-income and marginalized women who rely on Medicaid and the Indian Health Service for their healthcare.
"Under the Supremacy Clause of our Constitution, federal law preempts state law", Warren wrote.
If passed, the bill will see Missouri introduce some of the most stringent laws on abortion in the U.S., allowing terminations only in cases of medical emergency. Under the law, doctors who performed abortions could face up to 99 years in prison.
Similar to the Alabama Human Life Protection Act singed into law on Wednesday, the Missouri Stands With the Unborn Act has an exemption for the life of the mother but not in cases of rape or incest.
Echoing a common talking point, New York Democrat Rep. Alexandria Ocasio-Cortez suggested that the law would make abortion punishable with jail time, including "women victimized by rape+incest", while lamenting the lack of "added punishments for rapists".
Earlier this month, Georgia passed similar legislation, banning all abortions after six weeks, following similar laws in MS and Ohio. But even Ivey acknowledged in a statement that all-but-certain legal challenges likely will block the law.
"We must go beyond abortion, to ensure access to contraception, STI prevention and care, comprehensive sex education, care for pregnant moms, safe home and work environments, adequate wages, and so much more", wrote Warren. She cited a 2018 NBC/Wall Street Journal poll showing that 71 percent of Americans believe the decision should not be overturned, including 52 percent of Republicans. "Second, they must prohibit states from interfering in the ability of a patient to access medical care, including abortion services, from a provider that offers them".
She posted their photos and used colourful words to describe them on her social media pages in opposition to the signing and approval of the bill this week.
Numerous entertainment personalities rallied against the law as well, People reports.