Sunday September 12: The nation observes the 20th anniversary of 9/11, the 1st without troops in Afghanistan

On the 20th anniversary 9/11 President Biden and former presidents paused to reflect. Both Biden and former President Bush praised the unity in the weeks after the attack and denounced the division in the country today.

Plus the Biden Administration's new vaccine requirements that will impact 100M workers --and the GOP backlash.

And exclusive new CNN polling showing a potential trouble sign for a 2024 Trump run.

On today's panel: CNN's Jeff Zeleny, Asma Khalid of NPR, CNN's Melanie Zanona, Zolan Kanno-Youngs of the New York Times.

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