Setting aside the traditional left versus right arguments, surely there is another reason why a woman cannot conceive as a result of legitimate rape.
Why?
Because there is no such thing as legitimate rape.
"Rape is the commission of unlawful sexual intercourse or unlawful sexual intrusion." http://legal-dictionary.thefreedictionary.com/rape
That's the definition.
Rape is necessarily illegitimate. A woman may not conceive during an act that does not exist.
Doesn't stop the idiot candidate from being an idiot. His unsympathetic, self-righteous and multipally misinformed justification tells you much of what you need to know about him. But if they exist, which is doubtful, maybe his "doctors" are smarter (in a legalistically pedantic way) than he is.