line. it gives a sense of the magnitude of the challenge he's facing. i think john will like this. at one point he said disagreement must not lead to dis-union. i was struck by that word, university of santa bash barbara has a database he was the first to use that word since 1861. no president felt the threat was material enough he felt the need to discuss it yet there it was in biden's first remarks as president. >> why do you think? >> because i think the magnitude of the threat. i heard a piece on cnn this week quoting historians saying this is probably the greatest threat to america's fundamental cohesion since the civil war, not because we haven't been divided before but because of the force that's would undermine the constitutional order now have such a hold on one of the

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