Hillary Clinton has been praised for her composed performance in the first Presidential Debate on Monday night. One of the Democratic nominee's most impressive moments came in the final minutes, when Clinton fought off an interruption from Trump by bringing up Alicia Machado, a former winner of Trump's Miss Universe pageant.

Hillary Clinton came out on top, but the night of the Presidential Debate still belonged to Donald Trumppinterest
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So, why did Clinton give a shout-out to Miss Venezuela? 

39-year-old Machado, who represented her country in the beauty contest in 1996, has been sharing the story of her "humiliating" encounter with Trump in support of Clinton's election campaign. 

Earlier this year, she revealed to Inside Edition that Trump referred to her as "Miss Housekeeping" and "Miss Piggy" after she put on weight following her victory. 

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As Clinton reminded Trump of his degrading remarks, she told him the South American model had recently become a US citizen. 

While Trump tried to challenge his opponent and asked, "Where did you find this?" Clinton delivered a brilliant response. "You can bet she's going to vote this November," she said with pride.

Machado was quick to show her support for Clinton's attack on Trump.

"Thanks Hillary Clinton, your respect for women makes a difference. I'm with you," she tweeted.

"I'm so proud to be a US citizen. I'll be voting."

Later, Clinton shared a powerful campaign advert starring Machado. See the full story behind the model's Miss Universe experience and why she vows to vote Hillary below.