“I’ll be voting no,” Mr. Trump told Fox News, even as he said he disagreed with his home state’s current ban on abortions after six weeks of pregnancy.

Passage of the ballot measure, called Amendment 4, would allow patients to seek an abortion up to about 24 weeks of pregnancy.

Mr. Trump has said he has “no regrets” about his role in the reversal of Roe, but he has also embarked upon an election-season effort to present himself as supportive of abortion protections and reproductive rights.

Last week, Mr. Trump claimed on social media that his administration would be “great” for women’s “reproductive rights.” And on Thursday, he said he would require insurance companies or the federal government to pay for all costs associated with in vitro fertilization treatments if he won in November.

Mr. Trump’s announcement regarding I.V.F. coverage contained few specifics about the proposal or how he might address its cost.

Neil Vigdor contributed reporting.

The Democrats are trying to frame this election on one issue, that being abortion because they have no other. These malcontent pervs have destroyed the country in four years. Murders, rapes and robberies have escalated under Biden; don’t expect anything less from the Lame Brain Harris. We look for more rampage by gang bangers, more illegal murdering, more inner city bankruptcies, and more busted city budgets.