In the last week of his presidency Donald Trump is being purged from the political mainstream. Congress has impeached him again. He has been booted off social media. A major golf tournament has been pulled from one of his courses. How should Donald Trump and his followers be held to account for damaging American democracy?

We speak to Elizabeth Neumann, who led the counterterrorism office at the Department of Homeland Security, and Megan Squire, a professor of computer science at Elon University who tracks online extremism. The Economist correspondents Steven Mazie and Leo Mirani also join us.

John Prideaux, our US editor, hosts with New York bureau chief Charlotte Howard and Jon Fasman, US digital editor.

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