Sen. Bernie SandersBernie SandersFive House Democrats who could join Biden Cabinet Biden names John Kerry as 'climate czar' in new administration In the final chapter of 2020, we must recommit to repairing our democracy MORE (I-Vt.) said he may have appeared angry during Hillary ClintonHillary Diane Rodham ClintonThe Hill's 12:30 Report - Third vaccine candidate with 90% efficacy Biden won — so why did Trump's popularity hit its highest point ever? The Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - Calls mount to start transition as Biden readies Cabinet picks MORE's presidential nomination acceptance speech during the Democratic National Convention, but his face always looks like that. 

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"I always have that look on my face. That's nothing new," Sanders said on CBS's "Face the Nation." 

"I am not always the smiling kind of guy." 

Many noticed Sanders looked angry during the speech, including Republican presidential nominee Donald TrumpDonald John TrumpBiden team wants to understand Trump effort to 'hollow out government agencies' Trump's remaking of the judicial system Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit MORE.

"The dishonest media didn't mention that Bernie Sanders was very angry looking during Crooked's speech. He wishes he didn't make that deal!" Trump tweeted Thursday.