One of the Nation's writers is defending George Tiller against accusations that Tiller broke a Kansas law 19 times by performing abortions when the unborn child was viable without getting "documented referral from another physician not legally or financially affiliated" with him saying "(1) The abortion is necessary to preserve the life of the pregnant woman; or (2) a continuation of the pregnancy will cause a substantial and irreversible impairment of a major bodily function of the pregnant woman."
The article by Peter Rothberg describes abortions on viable unborn children as "any late-term abortion procedure." Rothberg also describes the law as a "new law" when the last time this legislation was updated was 1998.
It appears Rothberg's main source of information about this law wasn't the law itself but a blog post at Feministing which notably doesn't link to the law it attacks.
The Feministing post also attacks the motives of current Attorney General Paul Morrison by claiming "Kansas Attorney Generals have a history of baselessly attacking Dr. Tiller" without noting that Pro Kan Do (a pro-choice group in Kansas) spent $95,000 attacking Morrison's opponent, Phil Kline, in the last election in the hopes of getting Morrison elected.