The Pain-Capable Unborn Child Protection Act, or SB 127, becomes law 90 days after the Dec. 13 signing. It is the 18th anti-abortion measure Kasich has signed since becoming governor in 2011.
Current Ohio law bans abortions after a fetus has begun its 20th week of gestation, unless a doctor determines that the fetus is not viable outside the womb. The new law eliminates the viability test and simply bans abortions past 20 weeks. The current exception for the woman's health still applies.
"I agree with Ohio Right to Life and other leading pro-life advocates that S.B. 127 is the best, most legally sound and sustainable approach to protecting the sanctity of human life," Kasich said in a statement.
The governor also explained how he has worked to strengthen Ohio's protections for the sanctity of human life during his two terms in office, but that he felt the provisions in the heartbeat bill "are clearly contrary to the Supreme Court of the United States' current rulings on abortion."
It was a stance that Ohio Right to Life encourage Kasich to take. Mike Gonidakis, Ohio Right to Life president, had said a fetal heartbeat bill likely would not have been upheld in the courts and that having such a strict standard overturned would have harmed the pro-life movement.
The Supreme Court ruled in January that North Dakota officials could not enforce the state's fetal heartbeat law. A federal judge overturned a similar law in Arkansas in 2014.
"We sincerely thank Gov. Kasich for his unwavering support for the unborn and our pro-life mission," Mike Gonidakis, Ohio Right to Life president, said in a statement. "By signing SB 127, the 20-week ban, Gov. Kasich will save hundreds of unborn lives each year and he positioned the state of Ohio to directly challenge Roe v. Wade.
However, Molly Smith, president of Cleveland Right to Life, criticized the veto, saying many Ohioans are questioning Kasich's pro-life commitment.
"The governor had a chance to end abortion in Ohio and instead killed the opportunity by vetoing the bill," she said in a statement.
Smith also opposed Ohio Right to Life's position on the fetal heartbeat bill, saying the statewide organization's rationale for opposing it "makes absolutely no sense." She cited the opinions of constitutional lawyers who believed Ohio's measure would have withstood a court challenge.
"We are truly saddened by the lost opportunity (to ban all abortions) but will not give up the fight to protect all human life," Smith's statement said.
Supporters of keeping abortion legal weighed in as well, saying Kasich's signing of the measure infringes on the right of women to decide the issue for themselves.
"Yet John Kasich and the Ohio state Legislature are intent on taking that right away," Iris E. Harvey, president and CEO of Planned Parenthood Advocates of Ohio, said in a statement.
Harvey said women will continue to vocally oppose abortion restrictions. "Women are tied of politicians telling us what to do with our bodies," she said.
Twelve other states have enacted 20-week laws that have gone unchallenged, although similar bans have been struck down by courts in Arizona and Idaho.
The American Civil Liberties Union has pledged to challenge the Ohio law in court.