A progressive activist who identified himself as diagnosed with Lou Gehrig's Disease (ALS) confronted Sen. Jeff Flake (R-Ariz.) on an airplane this week over Flake's vote on the GOP tax-reform bill.

Activist Ady Barkan, a staffer at the Center for Popular Democracy, questioned Flake on Thursday after the Arizona Republican voted in favor of the GOP tax-reform bill that passed the Senate in a late-night session last week. Videos of the 11-minute conversation were posted on Twitter.

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