Biden tests positive for Covid

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President Biden tests positve for covid as Senior Democratic congressman Adam Schiff adds his voice to calls from within the party asking him to to leave the presidential race. Presenter Roger Hearing discusses Donald Trump's comments on funding the defence of Taiwan - and tech stocks tumble over fears about the security of the global microchip supply. Plus the UK government commits to renationalising the railways - is this a sign of a change in the western mantra that state ownership of business doesn't work?