Jon Karl reports on the new investigation into reports of dirty tricks in the Alaska Senate Race as President Trump campaigns in South Carolina; as Pres. Trump weighs whether to launch new strikes against Iran, Rachel Scott has details on Sec. Pete Hegseth firing a top general at the Pentagon claiming he leaked classified information; David Muir looks back at the life and legacy of Sir Patrick Stewart – the legendary actor known for his roles in "Star Trek," "X-Men," and more – who has died at 86 following a "brief" battle with Alzheimer's disease and Lewy body dementia; and more on tonight’s broadcast of World News Tonight with David Muir.
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