CNN's Kaitlan Collins joins country music legend Willie Nelson aboard his tour bus to talk about the inspiration behind Farm Aid, and hears a surprising story about his visit to the White House in 1979.

Nelson is set to perform this weekend at the 40th annual Farm Aid festival, along with Bob Dylan, Neil Young, Dave Matthews and more. "Farm Aid 40" airs live on Saturday, September 20 at 7p ET on CNN. 04:45 - Source: CNN

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