Missouri is the most populous state where a ballot measure could roll back a current ban on abortions at all stages of pregnancy.

Missourians voted yes on Amendment 3, but the fight over abortion access doesn’t end there. Amendment 3 was put on the ballot by initiative petition, requiring thousands of signatures from people all over Missouri. It faced several legal challenges, such as going to the state’s Supreme Court before settling the matter.

Missouri’s abortion ban is not automatically repealed as a result of voters overturning the ban on Tuesday. So, Planned Parenthood said it is suing Missouri to put an end to several longstanding abortion restrictions.