Jay O'Brien reports on HHS Secretary Robert F. Kennedy Jr. defending himself as frustrated lawmakers from both parties demanded answers on whether he’s trying to limit Americans’ access to vaccines – and firing top health officials who stand in his way; Kayna Whitworth reports on the pursuit and arrest of a domestic violence suspect prompted by a woman, who police say, used a hand signal in a convenience store to ask for help; Matt Gutman looks back at the life and legacy of legendary Italian designer Giorgio Armani, who died at age 91, and how he redefined the fashion industry; and more on tonight’s broadcast of World News Tonight with David Muir.

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