Joe Biden has acknowledged that he should have pushed for a bigger national programme to distribute free rapid Covid-19 tests earlier, as the US testing supply crunch worsens just before Christmas.
The US president announced this week that the federal government would buy 500m at-home tests and send them through the post, starting in January.
But he admitted on Wednesday night that he wished he had issued that order months earlier, as cities at the centre of the Omicron outbreak, including New York and Washington, DC, experience long queues for tests.
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