MSNBC is airing the six-part documentary series David Frost Vs, built around some of the most extraordinary interviews conducted over a 50-year period by David Frost, the legendary British journalist and entertainer. We speak with executive producer Wilfred Frost, one of David's sons, about his dad's tête-à-têtes with Richard Nixon, Elton John, Muhammad Ali, John Lennon, Yoko Ono and more.

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