The details of Mr. Fernández’s proposal — including the latest stage at which pregnancies could be terminated — have yet to be announced. But tens of thousands of women took to the streets in Argentina on Wednesday to support the bid to do away with the country’s restrictive abortion laws.

Across the country, as they did in 2018, demonstrators waved or wore the green handkerchief that has become synonymous with the abortion rights movement.

“The abortion law is much more than the right to perform an abortion,” said María del Valle Stigliano, 30, a copywriter. “It recognizes women as independent people who have the right to decide over our bodies.”

“The church is never going to be in favor of this and there are people who are always going to be against legalizing abortion, but that doesn’t matter,” Ms. del Valle said. “We need to focus on the people who still haven’t made up their mind. That’s how we’re going to win.”

For Denise Cutuli, a 20-year-old communications student, there is a sense of inevitability to the debate. “Sooner or later, abortion will be law, but the sooner we can get it approved the fewer women who will die from clandestine abortions,” she said. “We aren’t asking for anything crazy. Lots of other countries have already done this, and it has shown that the rate of mortality decreases when abortion becomes legal.”