Andrew Witty, chief executive officer of UnitedHealth Group Inc., testifies at a Senate Finance Committee hearing in Washington, DC, on May 1, 2024 about the Feb. 21 cyberattack that paralyzed much of the US health-care system. Photo: Al Drago/Bloomberg

Members of the Senate Finance Committee finally had their opportunity on Wednesday to grill UnitedHealth Group CEO Andrew Witty about the cyberattack on the company's Change Healthcare subsidiary. Senators from both parties demanded answers about why the attack happened – and what Witty is doing about it.

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