Former Democratic presidential candidate Howard Dean on Monday mentioned cocaine in a tweet discussing Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s sniffling during his first presidential debate.

Notice Trump sniffing all the time. Coke user? — Howard Dean (@GovHowardDean) September 27, 2016

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Dean’s tweet may prove controversial for mentioning — without evidence — illicit drug use and the Republican presidential nominee in the same breath.

Trump frequently and audibly sniffled Monday night during his clash with Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE at Hofstra University in Hempstead, N.Y.

The real estate tycoon’s snorts were picked up by the television audience, which experts predicted may have exceeded 100 million people.

More viewers raised questions about Trump’s health on social media, an interesting twist after the Republican candidate seized Clinton’s health scare earlier this month to raise questions about her fitness to serve as president.

Trump has a cold. — Tony Fratto (@TonyFratto) September 27, 2016

The DT sniffle is gonna become a thing...no? — David Gregory (@davidgregory) September 27, 2016

Hillary Clinton nearly collapsed earlier this month during a 9/11 memorial ceremony. Her doctor revealed shortly afterward she had diagnosed the Democratic presidential nominee with pneumonia two days before the incident.