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Watch live coverage as President Biden delivers remarks on new measures to combat Covid-19 and the omicron variant during a visit to the National Institutes of Health.

Major League Baseball plunged into its first work stoppage in a quarter-century when the sport’s collective bargaining agreement expired and owners immediately locked out players in a move that threatens spring training and opening day.

   (CNN) -- Dr. Mehmet Oz, a cardiothoracic surgeon and television personality, is running for the US Senate in Pennsylvania as a Republican, according to an op-ed published Tuesday in the conservative Washington Examiner.

Former President Donald Trump’s lawyers will try to persuade a federal appeals court to stop Congress from receiving call logs, drafts of speeches and other documents related to the Jan. 6 insurrection at the U.S. Capitol led by his supporters.

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Twitter CEO Jack Dorsey will step down as head of the social media platform he co-founded a decade and a half ago, the company announced on Monday.

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U.S. health officials say Merck's experimental COVID-19 pill is effective but they raised questions about its safety during pregnancy. The FDA posted its review Friday ahead of a public meeting next week where outside experts will debate the drug's benefits and risks.

The Biden administration has recommended an overhaul of the nation’s oil and gas leasing program to focus on areas that are most suitable for energy development and raise costs for energy companies to drill on public lands and water.

The discovery of a new coronavirus variant sent a chill through much of the world as nations raced to halt air travel, markets fell sharply and scientists held emergency meetings. But the risks of the variant remained largely unknown.