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The language will be lofty, the heart strings will be tugged. Both sides will invoke the hand of American history, the weight of the US constitution, the love of truth, the rise of tyranny and the decline of democracy.

The impeachment trial of Donald Trump is quite a moment. And everything is being thrown at it.

How will the trial unfold? Will there be witnesses and testimony? And could the septuagenarian senators be secretly relishing a shorter trial?

David Grossman reports from Washington.