By passing a bill, by a simple majority. The pro-life movement has been hoodwinked by the Catholic bishops, Nellie Gray, the National Right to Life Committe, the GOP, etc., etc., into thinking a Constitutional amendment is the only option.
They couldn’t even get a bill to ban abortion after 20 weeks through. And after the obama budget passed by ryan etal who knows what kind of coat tails Trump will have for the GD RINOs in congress. That could be the reason he said he could cut deals with nancy.