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(CNN) -- Karl Rove's suggestion that Hillary Clinton suffers from a brain injury is coming under attack.

Rove, the mastermind behind George W. Bush's two presidential election victories, appeared at a conference last Thursday, where he discussed a 2012 incident that sent the then-secretary of state to the hospital, according to the New York Post's Page Six, the newspaper's well-known gossip column.

"Thirty days in the hospital?" asked Rove, a Fox News Channel contributor, according to the report. "And when she reappears, she's wearing glasses that are only for people who have traumatic brain injury? We need to know what's up with that."

Clinton, who's seriously considering a second bid for the White House, suffered a blood clot in December 2012, after falling. After first going to the hospital for testing, Clinton later was admitted for a three-day stay at a hospital in New York City.

Hillary Clinton's career in the spotlight

Hillary Clinton's career in the spotlight

Hillary Clinton's career in the spotlight

Hillary Clinton's career in the spotlight

Hillary Clinton's career in the spotlight

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Rove hints Clinton has brain damage