A Gallup poll shows "email" is the word most commonly associated with Hillary Clinton.

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No matter what Hillary Clinton does, it seems she just can't shake the questions surrounding her use of a private email server while she was secretary of state.

A Gallup poll found that "email" has been far and away the word most commonly associated with Clinton dating back to July 2016.

In association with the University of Michigan and Georgetown University, Gallup conducted more than 30,000 interviews and asked U.S. adults what they could remember regarding the two major presidential candidates: Clinton and Donald Trump.

Clinton has tried to move on from the email controversy, but fresh hearings and investigations keep cropping up.

Clinton is legally compelled to answer 25 questions about her email use by Oct. 13 because of a Freedom of Information Act request from the watchdog group Judicial Watch.

Republicans say learning about the emails is a matter of national security, but Democrats contend the email inquiries are just an effort to damage Clinton's presidential bid. Either way, it's contributed to the perception that Clinton is untrustworthy.

During eight of the 10 weeks of Gallup's research, the word "email" popped up more than any other. The only words that supplanted email were "convention," during the Democratic National Convention, and "health" last week when Clinton came down with a case of pneumonia.

Trump's results, on the other hand, shifted week to week depending on the stories in the news. "Obama" and "Mexico" appeared twice, with "president" "convention" "Russia" "family" "campaign" and "immigration" dominating the Trump-related headlines the rest of the time.

Clinton has launched numerous attacks on Trump's rhetoric and scandals, but the poll shows none have stuck to Trump the way the email story has stuck to Clinton.