Hillary Clinton 'felt unwell' at 9/11 ceremony. But her people said: Mrs. Clinton is doing a

US Democratic presidential candidate Hillary Clinton says she is "feeling great" hours after her early exit from a 9/11 ceremony raised health fears. Her campaign said earlier she had left the event in New York because she had "felt overheated" and had gone to her daughter's apartment. Mrs Clinton's Republican opponents have queried her physical fitness.

Her doctors say she made a full recovery from surgery she underwent in 2012 for a blood clot.

Mrs Clinton's personal doctor Lisa Bardack said last month she was "in excellent health and fit to serve as president of the United States".

The Clinton campaign has accused opponents of pushing a "deranged conspiracy about Clinton's health".

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Emerging from her daughter's home, Mrs Clinton said: "I'm feeling great. It's a beautiful day in New York."

She later left for her home in Chappaqua, New York, according to her campaign.

A video posted on Twitter purports to show Mrs Clinton being supported by aides at the 9/11 ceremony before being helped into her van.

The statement from the Clinton campaign said: "Secretary Clinton attended the September 11th Commemoration Ceremony for just an hour and thirty minutes this morning to pay her respects and greet some of the families of the fallen.

"During the ceremony, she felt overheated so departed to go to her daughter's apartment, and is feeling much better."

Mrs Clinton previously served as secretary of state and retains an honorary title.

The weather was warm and humid in New York on Sunday, and there was a breeze during the ceremony, the Associated Press reports.

The candidate came to the ceremony fresh from a political storm over comments she made about Mr Trump's supporters at a fundraiser on Friday.

She had apologised on Saturday for suggesting half of the Republican's supporters were "deplorables".

Mrs Clinton is next due to appear on the Ellen DeGeneres Show on Wednesday and attend a rally in las Vegas on the same day.

Mr Trump said health had now become "an issue" in the election campaign.

Mrs Clinton was taken ill on Sunday at a 9/11 memorial ceremony and cancelled a campaign trip to California.

Mrs Clinton had "overheated" but was now re-hydrated and was "recovering nicely", her doctor said.

Mr Trump wished her a speedy recovery and said he would release the results of a medical examination he took over the past week, with "very, very specific numbers".

"Hopefully they're going to be good. I think they're going to be good. I feel great,"he told Fox News.

So far Mr Trump has only released a note, in which his doctor declared that he would be "the healthiest individual ever elected to the presidency".

Mr Trump, 70, and Mrs Clinton, 68, are among the oldest US presidential candidates in history.

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On Sunday, video showed Mrs Clinton being supported by aides as she entered a van to leave the 9/11 ceremony after an hour and 30 minutes.

• The Mariana DAngelo Editorial Group