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The image was from last week's GOP debate. It was sent as the three Republican candidates continued their bickering on Thursday's Fox News debate in Michigan.

The clip of Clinton was from her marathon hearing in October in front of the GOP-led House panel investigating the 2012 terror attacks in Benghazi, Libya.

The tweet received nearly 19,000 retweets. Another tweet by Clinton's campaign on gay marriage was retweeted more than 12,000 times during the debate.

Marriage equality is the law of the land. Deal with it. #GOPdebate pic.twitter.com/gPS1BVgipl — Hillary Clinton (@HillaryClinton) March 4, 2016

Trump dominated the overall Twitter conversation, with 62 percent of buzz, according to Twitter, followed by Cruz, at 16 percent; Rubio, at 15 percent; and John Kasich, at 7 percent.

The most tweeted-about moment of the GOP debate was an exchange where Trump was forced to defend his previous business ventures, including Trump University, after attacks by Rubio: