Hillary Clinton 'stumbles' At 9/11 Event

US Democratic presidential candidate Hillary Clinton says she is "feeling great" after leaving a 9/11 ceremony early.

Democratic presidential candidate Hillary Clinton fell ill during a memorial service marking the 15th anniversary of the Sept. 11, 2001, terrorist attacks, and left abruptly, inserting new speculation about her health into a presidential campaign in which Republican Donald Trump has called her weak and unfit.

Video of Clinton’s hurried departure from the Ground Zero memorial showed her buckling and stumbling as she got into her van. Clinton’s campaign issued a statement from her doctor later Sunday revealing that she had been diagnosed with pneumonia two days earlier

Hillary Clinton has pneumonia, her doctor said Sunday, hours after the Democratic nominee stumbled and exited a 9/11 commemoration ceremony early. The incident seems certain to prompt further scrutiny of Clinton's health and her campaign's transparency -- though Republican rival Donald Trump was uncharacteristically silent throughout a solemn day marking the 15th anniversary of the September 11 attacks.

Clinton, 68, was diagnosed on Friday with pneumonia, and "was put on antibiotics, and advised to rest and modify her schedule," Dr. Lisa Bardack said in a statement.

"While at this morning's event, she became overheated and dehydrated. I have just examined her and she is now re-hydrated and recovering nicely," said Bardack, chairman of internal medicine at the Mount Kisco Medical Group. Bardack attended to Clinton at her Chappaqua home Sunday.

The Clinton campaign declined to answer questions Sunday why her diagnosis wasn't disclosed Friday. But the episode quickly impacted Clinton's campaign. Late Sunday night a campaign spokesman said a Clinton trip to California was being scrubbed, including several high-dollar fundraisers and television appearances by the candidate.

Clinton's health came into sharp focus Sunday as she appeared wobbly and stumbled as Secret Service agents helped her into a van to exit a memorial service marking the 15th anniversary of the September 11, 2001, attacks. The Democratic nominee traveled to her daughter's nearby apartment and the campaign initially said she felt "overheated."

A video of Clinton's departure from the 9/11 event at Ground Zero in Manhattan, posted by Twitter user Zdenek Gazda (@zgazda66), shows her clearly stumbling, with Secret Service agents helping her into the van in the motorcade.

Leaving her daughter's apartment a little before noon, Clinton told reporters she was "feeling great.

"It's a beautiful day in New York," she added, while smiling and waving to supporters on the street before getting into her motorcade.

On Sunday night campaign spokesman Nick Merrill said a planned California campaign trip Monday and Tuesday has been scrubbed.