Vice President Kamala Harris’ allies on Friday accused former President Donald Trump of “gaslighting” Americans with his new campaign promise to have the federal government or insurance companies cover the cost of in vitro fertilization.

“Donald Trump fools no one,” Sen. Elizabeth Warren, D-Mass., said during a press call arranged by the Harris campaign. “Despite what he seems to think, American women are still not stupid, and we will not trust our futures to the guys who took away legal protection for abortion and IVF.”

Trump made the vow during a campaign rally Thursday in Michigan. He did not provide details on how the program would work or how it would be funded. 

“I’m announcing today in a major statement that under the Trump administration, your government will pay for — or your insurance company will be mandated to pay for — all costs associated with IVF treatment,” Trump said. “Because we want more babies, to put it nicely.”

According to the website Fertility IQ, a single cycle of IVF costs around $23,474.

Harris supporters said Trump’s promise does not comport with his past actions that include appointing three conservative Supreme Court justices who voted to overturn Roe v. Wade, saying he’s proud of his role in the landmark ruling and selecting Sen. JD Vance as his running mate just weeks after the Ohio Republican voted against a bill that would have protected IVF access nationwide.

“Forty percent of women in America now live under a Trump abortion ban, and if Donald Trump and JD Vance are in the White House, it won't be just 40%, it will be 100% of women,” Warren said. “Trump will ban access to abortion and IVF nationwide.”

Mini Timmaraju, president and CEO of the nonprofit advocacy group Reproductive Freedom for All, said she believes Trump is promising free IVF because he knows the Supreme Court’s ruling returning abortion laws to the states is unpopular.

“Every time reproductive freedom is on the ballot, it wins,” she said. “These issues are winners. The majority of Americans support abortion access. They support IVF. They support contraception. He has finally figured it out, and he'll do anything to distract from his abysmal, horrifying record on this issue. But we have the receipts. We have the evidence.”

Warren argued that while Trump is promising to make IVF available, he and Vance have not voiced support for a federal law to protect access IVF.

In June, Senate Republicans, including Vance, voted against a Democratic bill that would have done just that. Many GOP lawmakers argued the legislation went too far and dismissed it as an election-year stunt. Vance told CNN on Friday he voted against it because of “religious liberty.”

“I don’t want Christian hospitals or Christian charities to be forced to do something that they don’t want to do,” Vance said.

The Harris campaign also claims Trump supports a Republican platform that would threaten IVF. The platform says the GOP believes “the 14th Amendment to the constitution of the United States guarantees that no person can be denied life or liberty without due process, and that the states are, therefore, free to pass laws protecting those rights.”

The platform explicitly says Republicans “will oppose Late Term Abortion, while supporting mothers and policies that advance Prenatal Care, access to Birth Control, and IVF (fertility treatments).”

However, Alexa Kolbi-Molinas, deputy director of the ACLU Reproductive Freedom Project, has argued that Republicans are hiding their true plans for national bans on abortion, birth control and IVF “in plain sight.”

“The key to their true agenda here is the suggestion that the 14th Amendment of the federal constitution somehow empowers states to ban abortion,” Kolbi-Molinas told Salon last month. “They are signaling that embryos and fetuses are persons under the 14th Amendment, which is simply not true. And if that were the case, if embryos and fetuses had constitutional rights under the due process clause, states would be required to ban abortion.” 

The Harris campaign announced Friday it is launching a “Fighting for Reproductive Freedom” bus tour next week, starting in Palm Beach, Florida, a state that has an abortion amendment on the ballot in November. The campaign says the tour will make at least 50 stops in the lead-up to Election Day and aims “to hold Donald Trump and JD Vance accountable for the devastating impacts of overturning Roe v. Wade and their threats to access to IVF.”

Latorya Beasley, an Alabama woman whose IVF treatment was disrupted for months after the Alabama Supreme Court ruled in February that frozen embryos can be considered children under state law and that someone could be held liable for destroying them, prompting fertility clinics to pause IVF treatments, will be on the bus tour for one week to share her story. 

“It felt like my whole future was taken away from me in just an instant,” she said during Friday’s call. “It was a devastating moment for our family, financially, physically and emotionally. It took months before we could start IVF again. Donald Trump is directly responsible for what happened to me. It is only because Trump overturned Roe that MAGA Republicans were able to attack IVF in my state.”

The Alabama Legislature later passed a law granting clinics and health care workers criminal and civil immunity, restoring IVF treatments in the state. 

Beasley said that after Trump’s IVF promise Thursday, she is “more ready than ever before” to campaign for Harris.

“Donald Trump is trying to hide from his record,” she said. “I'm going to go out there and meet voters and tell them the truth. I know what Trump's policies really is on IVF because I lived it.”

Spectrum News’ Susan Carpenter and Cassie Semyon contributed to this report.