Trump impeachment: Senate says trial is constitutional and can go ahead

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Democrats prosecuting the case opened Tuesday's proceedings by showing a video montage of Mr Trump's 6 January speech and the deadly rioting by some of his supporters. The 56-44 split means six Republicans joined Democrats in voting to go ahead with the trial. Meanwhile, Twitter announces its quarterly numbers and surprises markets by saying it's considering new subscription services. And, we explore the knock-on financial impact of the Grenfell Tower disaster in Britain. Replacing dangerous building cladding materials is costing billions of dollars and driving some to bankruptcy. The BBC's Jamie Robertson is joined by Erin Delmore, political reporter in New York and Rebecca Jones, Bloomberg News Melbourne Bureau Chief. (Picture credit: Reuters)