Clinton aide responds to Buttigieg criticism of how she ran her campaign

An aide to Hillary ClintonHillary Diane Rodham ClintonThe Memo: Polls flash warning signs for Trump Polls suggest Sanders may be underestimated 10 declassified Russia collusion revelations that could rock Washington this fall MORE on Saturday slammed comments made in January by South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegTop adviser on Sanders: 'He's always been underestimated' Biden, Sanders lead Trump in hypothetical match-ups: poll The Hill's Morning Report - Trump hews to NRA on guns and eyes lower taxes MORE that were critical of how Clinton ran her 2016 presidential campaign.

"This is indefensible," Clinton spokesman Nick Merrill wrote on Twitter Saturday. "@HillaryClinton ran on a belief in this country & the most progressive platform in modern political history. Trump ran on pessimism, racism, false promises, & vitriol. Interpret that how you want, but there are 66,000,000 people who disagree. Good luck."

Buttigieg knocked Clinton in an interview with The Washington Post Magazine that was published Jan. 14. 

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Donald TrumpDonald John Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president MORE got elected because, in his twisted way, he pointed out the huge troubles in our economy and our democracy,” he told the outlet in the interview. “At least he didn’t go around saying that America was already great, like Hillary did.”

The article, titled "Could Pete Buttigieg Become the First Millennial President?" was published a little more than a week before the Indiana mayor announced he was forming an exploratory committee to run for president.

The relatively unknown Democrat has emerged as a serious contender for the party's 2020 presidential nomination in recent weeks.

Buttigieg has drawn fans as the star of a few viral moments, most recently when he was asked by a Norwegian outlet to speak their language. The polyglot speaks seven languages in addition to English: Norwegian, French, Spanish, Italian, Arabic, Maltese and Dari.  

If elected, the millennial Midwestern mayor would be the youngest and first openly gay president in U.S. history.