Tunnel to Towers founder on keeping the memory of his brother and many others alive 20 years later

Frank Siller, the founder and chairman of the Tunnel to Towers foundation, joins "CBS Mornings Saturday" co-host Dana Jacobson to discuss the legacy of his brother Stephen, a firefighter who rushed to the burning World Trade Center on September 11th, 2001. Joining Siller along his Never Forget Walk, Jacobson hears how the work of foundation has expanded over the last 20 years.

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