gisela mota was killed in her home on saturday, a day after taking office. the regional governor says it was meant to stop officials from calling in state police to fight corruption. mourners gathered yesterday to pay their respects, and some complained the government had failed to protect mayor mota. she was 33 years old. still to come on the newshour: what the iran-saudi conflict means for diplomacy in the middle east. on the 2016 campaign trail with new tactics and new ads. why armed protestors say they took over a national wildlife refuge. and much more. >> woodruff: now we return to the tensions between saudi arabia and iran. i'm joined by vali nasr, dean of the johns hopkins school of advanced international studies, and randa slim of the middle east institute. and we welcome you both.randa sd the saudis execute this cleric who they had imprisoned already for several years? >> this is a crisis that needs to be looked at through the context of a rivalry for power between saudi arabia and iran, and this execution is a message from the saudis to iran on do