RNC chairman on Clinton's town hall: 'No smile and uncomfortable'
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Twitter erupted when the Republican National Committee chairman implied that Democratic nominee Hillary ClintonHillary Diane Rodham ClintonBroadway play 'Hillary and Clinton' closing early due to low ticket sales Broadway play 'Hillary and Clinton' closing early due to low ticket sales Facing challenge from Warren, Sanders touts strength against Trump MORE should smile more after her appearance on NBC News for a presidential forum on Wednesday night. 

"Hillary Clinton was angry [and] defensive the entire time — no smile and uncomfortable — upset that she was caught wrongly sending our secrets," Reince Priebus tweeted after the event.

Clinton's campaign fired back:

Twitter users took notice of the comment on the former secretary of State's expression while answering serious questions.

MSNBC host Joe Scarborough got into hot water earlier this year when he told Clinton to smile after she won several big primaries, which many saw as a sexist comment.