Pressed on abortion in a recent interview, Trump blasted his rival, Florida Gov. Ron DeSantis, for signing a law banning abortions after the baby has a detectable heartbeat. Trump declared, “I think what he did is a terrible thing and a terrible mistake.” Trump is being honest. There is no reason to doubt that he said what he really believes: that restricting abortion to any meaningful extent is a terrible mistake and that he has no will to fight to protect human life in the womb. Before denouncing DeSantis (and, implicitly, every other Republican governor and state legislator who has...