From First One Through:
Many people have argued that it is illegal for Israelis to live beyond the 1949 Armistice Lines (east of the Green Line, EGL/Judea and Samaria/West Bank). The question of “legitimacy” (not legality) has been repeated often by the USA’s Obama Administration. Those comments are more harsh towards Israel than prior American administrations that simply viewed new settlements as “unhelpful” to a peace agreement between Israel and the Arab states. Jimmy Carter was the only US president that actually called the settlements “illegal”. Below is a review of the international laws that apply towards the settlements.