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11.55pm GMT

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11.46pm GMT

Donald Trump's former coronavirus testing tsar has urged the former president to address Covid vaccine hesitancy among Republicans, even as the man who some say has assumed Trump's platform and megaphone, the Fox News host Tucker Carlson, criticized vaccine outreach by the Biden administration.

Several recent surveys have shown vaccine hesitancy is highest among Republican men. Public health experts are scrambling to respond.

Related: Ex-Covid tsar urges Donald Trump to tackle Republican vaccine hesitancy