[JURIST] Missouri Governor Jay Nixon [official website] on Thursday said he will not sign legislation [press release] that would ban abortions [JURIST news archive] after 20 weeks of pregnancy. The measure [HB 213 materials] imposes penalties on doctors who fail to comply with the new restrictions. It would provide some exceptions, permitting abortions of viable fetuses only when the woman’s life is endangered by a physical illness or disability, or when continued pregnancy poses the risk of substantial physical impairment…