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Stephen Sackur speaks to Grover Norquist, who is one of the American right's most influential voices and a long-time fan of Donald Trump's platform.

After the second presidential debate, Donald Trump is still standing, just. He took the hail of incoming fire prompted by that old recording of his foul-mouthed sexual remarks and responded with ever-more strident attacks on Hillary Clinton. But many senior Republicans have disowned him. His disapproval ratings are sky high. Has Trump put the Republicans on the road to ruin?