Rep. Trent Franks of Arizona announced Friday afternoon that he will introduce a bill that would ban abortions after the fifth month of pregnancy (20 weeks after conception) nationwide–with exceptions for when the life or physical health of the mother is at risk.

Why 20 weeks? Franks’s bill points out that the child in utero is very developed at that point. Medical science indicates that at 20 weeks, if not earlier, a baby can feel pain. Some infants born that early survive long-term.