Why Trump fired the official charged with securing U.S. elections
On Tuesday night, President Trump fired Christopher Krebs, the top cybersecurity official at the Department of Homeland Security. The termination comes after Krebs, whose job it was to secure U.S. election systems, fact-checked Trump's false claims of voting fraud. But Krebs had earned bipartisan support for his successful efforts, and his dismissal drew wide criticism. William Brangham reports.