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President Joe Biden's Covid-19 response team is holding a news briefing Wednesday on the coronavirus pandemic, which has infected more than 29 million Americans and killed at least 527,720 in a little over a year.
Two administration sources told NBC News that the U.S. government plans to buy 100 million additional doses of Johnson & Johnson's Covid-19 vaccine. Biden will announce the plans Wednesday during a White House meeting with executives from J&J and Merck.
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J&J currently has a deal with the U.S. government to provide 100 million doses by the end of June. The federal government shipped out nearly 3.9 million doses of the single-shot vaccine last week and says it plans to distribute 16 million more by the end of this month.
Read CNBC's live updates to see the latest news on the Covid -19 outbreak.