The constitutional amendment that Arizona for Abortion Access is putting forward would create a “fundamental right” to receive abortion care up until fetal viability, or about the 24th week of pregnancy, with exceptions after that point if a health care professional decides it’s needed to “protect the life or physical or mental health of the pregnant individual.” Opponents of the measure have focused on the potentially broad application of the mental health exception, arguing that it would make it far too easy to end viable pregnancies.Under current Arizona law, abortion is legal up until the 15th week of pregnancy, with an exception after that to save the mother’s life and no exceptions after that point for rape or incest.

Cindy Dahlgren, a spokesperson for the It Goes Too Far campaign opposing the Arizona ballot measure, blasted the proposed amendment as overly broad in a statement that could be a preview of the messaging ahead of this fall’s election.

“Unfortunately, most voters are not told that under the unregulated, unlimited abortion amendment they will lose the required medical doctor, critical and common sense safety standards for girls and women seeking abortion, and moms and dads will be shut out of their minor daughter’s abortion decision, leaving her to go through the painful and scary process alone,” Dahlgren said.

Also looming over the abortion ballot battle is a state Supreme Court decision, which could drop at any moment, over an 1864 abortion ban that’s still on the books. That law has not been in effect since before Roe v. Wade, but it made performing or helping a woman obtain abortion care a felony punishable by two to five years in prison.

The uncertainty surrounding abortion rights in the state has led to an influx of volunteers donating their time and energy to Arizona for Abortion Access to gather signatures. Chris Love, a spokeswoman for the campaign, says the group has assembled over 3,000 volunteers.

One of those volunteers is Toby Urvater, a 62-year-old retiree who’s spending her free time gathering signatures outside small businesses in downtown Phoenix.

“I became a notary specifically for this referendum,” said Urvater, a Phoenix native. “I have grown up with Roe v. Wade,” she said. “It feels devastating to know that people across the country in some states do not have that choice anymore.” 

Deborah Nye, 75, is another volunteer gathering signatures for Arizona for Abortion Access. She got pregnant in high school, pre-Roe v. Wade, and made the difficult decision to have an illegal abortion at the time. 

“I ended up having an illegal abortion, I risked my life to do that. And I think it’s really sad that anybody should be put in that situation,” said Nye, recalling her teenage experience. 

Nye, a mother, says the thought of her daughter losing the right to have an abortion is what fuels her to gather more signatures. 

“My daughter is always in my mind when I’m doing this because she’s in her reproductive years right now. And I would never want her to be in the situation that I was in as a young woman,” Nye said.

While the organization isn’t stopping at half a million signatures, opponents of abortion rights tell NBC News that they have lawyers on retainer ready to scrutinize each and every signature Arizona For Abortion Access turns in. 

“Our goal is still 800,000,” Bruce said of her organization’s aim to more than double the number of valid signatures required to be turned in come July, adding: “All of our circulators are highly trained … and are all being very diligent in the way in which they are collecting signatures to make sure that we are well prepared to withstand any legal challenge the opposition plans to throw our way.”