An aide to 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 on Monday acknowledged the Democratic presidential nominee's campaign could have done a better job disclosing information after Clinton left a 9/11 memorial early but touted the candidate's transparency.

"We could have done better yesterday, but it is a fact that public knows more about HRC than any nominee in history," Clinton communications director Jennifer Palmieri tweeted.

We could have done better yesterday, but it is a fact that public knows more about HRC than any nominee in history. https://t.co/Q50oHK85wQ — Jennifer Palmieri (@jmpalmieri) September 12, 2016

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Her tweet was a response to David Axelrod, a former White House senior adviser to President Obama, who took a shot at Clinton on Twitter earlier Monday. Axelrod suggested Clinton has an "unhealthy penchant for privacy that repeatedly creates unnecessary problems."

In a subsequent tweet, Palmieri sought to draw a distinction between Clinton and Republican presidential nominee 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.

"In contrast to HRC, Trump has been less transparent than any nominee in modern history," she tweeted.

In contrast to HRC, Trump has been less transparent than any nominee in modern history. https://t.co/Q50oHK85wQ — Jennifer Palmieri (@jmpalmieri) September 12, 2016

Clinton left the 9/11 memorial early Sunday because she was dehydrated and overheated, according to her campaign.

A video surfaced later in the day that appears to show the Democratic nominee stumbling into a black van with the help of aides when departing.

She later returned to her home in Chappaqua, N.Y., and her doctor released a statement saying she had been diagnosed Friday with pneumonia.

She subsequently canceled a campaign trip to California.

Clinton's campaign has been criticized for not keeping the press appraised when she left the 9/11 event.

Trump has been raising questions about Clinton's health for months. On Monday, the GOP nominee said he hoped Clinton would get well soon and be back on the trail but noted that "something's going on."