The fallout from Venezuela’s powerful twin quakes has evolved into a major test for acting President Delcy Rodriguez, sending her scrambling to prevent the humanitarian disaster from becoming a political one as her mandate as interim leader expires on Friday. A day after Rodriguez angrily defended the competence of her government’s relief effort at her first news conference since the June 24 disaster, her main rival, exiled Venezuelan Nobel Peace Prize laureate Maria Corina Machado, issued her...