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WASHINGTON, DC - JANUARY 31:  U.S. President Donald Trump (C) arrives for a meeting with Homeland Security Secretary John Kelly (2nd L), National Security Advisor Michael Flynn, White House Government Initiatives Director Reed Cordish and other government cyber security experts in the Roosevelt Room at the White House January 31, 2017 in Washington, DC. Citing the hack of computers at the Democratic National Committee by Russia, Trump said that the private and public sectors must do more to prevent and protect against cyber attacks.  (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - JANUARY 31:  U.S. President Donald Trump (C) arrives for a meeting with Homeland Security Secretary John Kelly (2nd L), National Security Advisor Michael Flynn, White House Government Initiatives Director Reed Cordish and other government cyber security experts in the Roosevelt Room at the White House January 31, 2017 in Washington, DC. Citing the hack of computers at the Democratic National Committee by Russia, Trump said that the private and public sectors must do more to prevent and protect against cyber attacks.  (Photo by Chip Somodevilla/Getty Images)

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GOP questions timeline to repeal and replace Obamacare

House Speaker Paul Ryan suggests any overhaul to Obamacare may not be complete this year. CNN's Phil Mattingly reports.