“But in IVF sometimes there are successfully fertilized eggs that are then not implanted, and discarding them may be offensive to strict pro-life sensibilities.”
You are correct on both counts, but are ignoring two key facts here: (i) Trent Franks and his wife already had twin children with a surrogate mother who had fertilized eggs implanted through IVF and (ii) Trent Franks has asserted that they performed such implantations without violating their moral principles, including without discarding embryos. So Franks not only knows that IVF can be done morally and ethically (only fertilizing, say, two eggs, and implanting both of them), but he’s actually done it. If it is true that he asked one or two employees to have sexual intercourse with him so that she could be a surrogate mother for him and his wife (which I find very hard to believe), it would not be *because* of his Christian values, nor because of his pro-life principles.