JACKSON, Mississippi — A federal judge on Tuesday temporarily blocked a new Mississippi law that bans abortion after 15 weeks’ gestation — the most restrictive abortion law in the United States. The law took effect as soon as Republican Gov. Phil Bryant signed it Monday. The state’s only abortion clinic, Jackson Women’s Health Organization, quickly sued the state, arguing the law is unconstitutional because it bans abortion weeks before a fetus can survive outside the womb. U.S.