What is impeachment and how does it work?

Donald Trump faces impeachment proceedings for the second time following insurrection by his supporters - so how does it work?

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Trump slams 'evil' and 'corrupt' impeachment process following Senate acquittal

President Trump speaking following his impeachment acquittal said it had been "a disgrace".

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How Donald Trump reacted to his acquittal - and how he could complete victory

Trump’s first action was to troll his Democratic opponents.