“Planned Parenthood and other abortion centers will now have to choose between dropping their abortion services from any location that gets Title X dollars and moving those abortion operations off-site,” said Tony Perkins, the president of the Family Research Council. “Either way, this will loosen the group’s hold on tens of millions of tax dollars.”

Because Planned Parenthood has an outsize role in providing federally subsidized family planning services — it serves 41 percent of women who receive them — cutting the organization off from Title X money could have major consequences. An analysis in the journal Health Affairs found that in two-thirds of the 491 counties in which they are located, Planned Parenthood health centers serve at least half of all women obtaining contraceptive care from federally subsidized facilities. In one-fifth of the counties in which they are located, Planned Parenthood centers are the only federally funded option for obtaining family planning services.

The analysis of data compiled by the Guttmacher Institute found that, without Planned Parenthood facilities, “in the short term, it is doubtful that other providers could step up in a timely way to absorb the millions of women suddenly left without their preferred source of care.”

Still, stripping Title X money from the organization would not decimate it. Three-quarters of the federal money its clinics receive comes through Medicaid, the federal health program for the poor. The largest effect would most likely be felt by women who do not have health insurance, particularly in states that did not expand Medicaid under the 2010 Affordable Care Act.

Abortion opponents said they dropped the ‘domestic gag rule.’ It’s not that simple.

The policy is modeled on a Reagan-era rule that required the same physical separation between abortion and family planning services that the Trump administration is seeking to mandate. But there is a difference: While the 1988 regulations specifically barred Title X facilities from even mentioning abortion as an option for pregnant women — a prohibition that came to be known as the “domestic gag rule” — the version proposed this week does not ban such counseling.

Abortion opponents said the Trump administration plan would not silence any family planning organization, and thus could not be regarded as a domestic gag rule.

The proposal is “a recognition that when providers provide women with the real facts about abortion, there’s nothing to fear from that information,” said Steven H. Aden, the general counsel of Americans United for Life, “and that ordinarily women will choose not to engage in abortion. The old rule was both obsolete and unnecessary.”