Rep. Todd Akin, the Republican nominee for Senate in Missouri who is running against Sen. Claire McCaskill, justified his opposition to abortion rights even in case of rape with a claim that victims of “legitimate rape” have unnamed biological defenses that prevent pregnancy.

“First of all, from what I understand from doctors [pregnancy from rape] is really rare,” Akin told KTVI-TV in an interview posted Sunday. “If it’s a legitimate rape, the female body has ways to try to shut that whole thing down.”

Akin said that even in the worst-case scenario — when the supposed natural protections against unwanted pregnancy fail — abortion should still not be a legal option for the rape victim.