Wisconsin Gov. Scott Walker signed a bill into law on Monday banning abortions after 20 weeks of pregnancy unless a mother's life is in danger. The bill does not provide exception to victims of rape or incest. The Republican presidential contender said he backed the bill because a fetus can feel pain at five months into the pregnancy, which is a contentious argument disputed by many in the medical community. Advocacy groups for abortion rights decried the legislation, arguing procedures after 20 weeks of pregnancy make up less than 1 percent of all abortions and are typically due to the discovery of serious fetal anomalies. Wisconsin will become the 16th state to enact some for of 20-week ban.