 Among the speakers at night two of the Republican National Convention, Nikki Haley, former U.N. ambassador during the Trump administration, turned Trump critic when she was competing with him for the Republican presidential nomination that Trump has now secured. CBS News chief election and campaign correspondent Robert Costas at the RNC with more. Even as Republicans rally around Trump in the wake of last weekend's assassination attempt, tensions nonetheless remain from the primary where Haley challenged Trump and hit him hard.