A top surrogate for Hillary ClintonHillary Diane Rodham ClintonTop Sanders adviser: Warren isn't competing for 'same pool of voters' Anti-Trump vets join Steyer group in pressing Democrats to impeach Trump Republicans plot comeback in New Jersey MORE said that the Democratic presidential nominee needs to "smile more" in the upcoming presidential debates against Donald TrumpDonald John TrumpTrump pushes back on recent polling data, says internal numbers are 'strongest we've had so far' Illinois state lawmaker apologizes for photos depicting mock assassination of Trump Scaramucci assembling team of former Cabinet members to speak out against Trump MORE

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Former Pennsylvania Gov. Ed Rendell told NBC's Hallie Jackson that he was sure Clinton would be able to prove she's presidential — but added that he agreed with a recent controversial comment by the Republican National Committee chairman that Clinton should smile during the debate. 

"When people watch a presidential debate they’re looking — they sort of close their eyes and ask 'Can that person be president?' They’re not saying 'Can that person be authentic?' They’re not even saying 'Can that person be all that likable?' 'Is that person of presidential caliber?' I think she can demonstrate that. I think she can also be funny. And I hope that she will be," Rendell started.

"Is that advice you’ve given her," Jackson asked.

"Yeah, I actually agree with Reince Priebus — smile more."

Jackson quickly pointed out that Priebus "took a lot of heat for saying that."

"But if Trump says something stupid, I would just have a big smile on my face and then zing him. Zing him with a big smile on your face," Rendell responded.

The RNC chairman was blasted for his comments earlier this moment implying that Clinton should smile more following her appearance on NBC’s presidential forum.

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

Clinton quickly shot back on Twitter.