INDIANAPOLIS — Indiana state senators narrowly passed a near-total abortion ban Saturday during a rare weekend session, sending the bill to the House after a contentious week of arguments over whether to allow exceptions for rape and incest.

The Republican-controlled Senate voted 26-20 after about three hours of debate, passing it with the minimum 26 votes needed to send it on to the House.

The bill would prohibit abortions from the time a fertilized egg implants in a uterus. Exceptions would be allowed in cases of rape and incest, but a patient seeking an abortion for either reason would have to sign a notarized affidavit attesting to the attack.

Indiana is one of the first Republican-controlled states to debate tighter abortion laws since the U.S. Supreme Court last month overturned the precedent establishing a national right to an abortion. But the GOP splintered after the rape and incest exceptions remained in the bill, and 10 Republican senators voted against the legislation.

Abortion rights supporters said before the vote that the bill went too far. Dr. Roberto Darroca, one of several physicians who testified against it, advocated for an exception to preserve the health of the mother.

“Decisions must be made rapidly. Having to wait for legal counsel would freeze this decision-making process,” Darroca said. “Can you imagine the dilemma the physician faces? The physician’s liberty versus the life of the patient and the child?”

Abortion opponents said it didn’t go far enough.

Mark Hosbein was among a large crowd at the Statehouse on Tuesday. For the second straight day in the special legislative session, cheers and shouts from protesters could be heard during committee hearings in Senate chambers. Hosbein, of Indianapolis, said he supports an abortion with no exceptions – even to protect the life of the mother.

“It’s wrong to try to kill the mother to save the baby, and it’s wrong to try to kill the baby to save the mother,” he said. “There are all kinds of limits, restrictions and everything going on here. But I’m here in hopes of stopping the whole thing.”

Kayce Kean and other abortion rights demonstrators protest outside the Indiana Statehouse during the ongoing special session Friday in Indianapolis. Jenna Watson/The Indianapolis Star via AP

A national poll this month found an overwhelming majority of Americans believe their state should generally allow abortion in specific cases, including if a woman’s life is endangered or if the pregnancy is the result of rape or incest. Few think abortion should always be illegal, according to The Associated Press-NORC Center for Public Affairs Research poll.

Thursday evening’s Senate vote on the amendment that would have removed the rape and incest exceptions failed 28-18, with 18 Republicans and 10 Democrats joining to retain the exceptions.

Some of the Republicans who did not want the exceptions will have to support the bill for it to advance from the Senate to the GOP-controlled House.

Nicole Erwin, of Planned Parenthood Alliance Advocates Indiana, said Friday that she expected passage in the Senate, followed by House lawmakers adopting a full ban.

“They’ve been waiting for this moment for far too long,” Erwin said in a statement. “We’ve seen time and again we can only expect their worst, which means passing an outright ban on abortion.”

Anti-abortion groups have sought to ratchet up pressure on conservative lawmakers.

If they don’t pass legislation during the three-week session, “they need to explain to the voters why they have done nothing in Indiana to address this issue,” Mike Fichter, president of Indiana Right to Life, said early in the week.

Republican House Speaker Todd Huston declined to talk about what’s in the Senate bill, but said he supports the rape and incest exceptions.

“I’ve kind of told myself we will address all this next week,” he said.