Trump impeachment: US senator decides to block witnesses

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Democrats in the US have been dealt a major blow in their desire to call witnesses at President Trump's impeachment trial. One of the few wavering Senators decides to vote against the measure. UK Prime Minister Boris Johnson is to hail the "dawn of a new era" today as the UK prepares to leave the European Union after 47 years. And we go to Nigeria where residents in Port Harcourt have been told to stay indoors, because of air pollution brought on by black soot.