Doctor: Clinton has pneumonia, was dehydrated and overheated Sunday

Democratic presidential nominee former Secretary of State Hillary Clinton at the September 11 Commemoration Ceremony in New York City.

Questions about the health of Hillary Clinton have dogged the campaign of the presidential candidate and hit a fever pitch when the former First Lady apparently collapsed Sunday while appearing at a 9/11 memorial ceremony in Manhattan.

According to multiple sources, Clinton appeared to faint during the ceremony and was quickly whisked away to daughter Chelsea's nearby apartment, after what a source characterized as a "medical moment".

Democratic presidential candidate Hillary Clinton gets into a van as she leaves an apartment building Sunday, Sept. 11, 2016, in NY. But on this 15th anniversary of that tragic day, Hillary Clinton left the 9/11 ceremony early after overheating.

Democratic candidate Hillary Clinton, who has been diagnosed with pneumonia, became overheated and fell ill at a September 11 memorial ceremony. Crowley said that despite the temperate weather outside, heat was an issue for those standing on the cobblestones at the ceremony. -- 12:45 p.m. A video posted on Twitter shows Hillary Clinton from behind held closely by a member of her staff, before slumping and being helped into a waiting van as she leaves the 9/11 memorial service in NY.

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

Sunday's event has led reporters and others to demand she and Republican rival Donald Trump release detailed health records.

An hour later, Clinton emerged from the apartment to reporters asking, "What happened?"

It's an accusation that Clinton has sought to play off as a "wacky strategy" from Trump and evidence that he embraces an "alternative reality". She poked fun of the idea during an appearance on ABC's "Jimmy Kimmel Live" last month, jokingly opening a pickle jar as proof of her vigor.

Trump said in an interview last week that he would release his full medical records if Clinton makes her records public. "Without examining, without having the history. you don't have a basis to say anything". "On Friday, during follow-up evaluation of her prolonged cough, she was diagnosed with pneumonia", Bardack said in a statement released by Clinton's campaign. "She was put on antibiotics, and advised to rest and modify her schedule", Bardack said in a statement.

Asked whether she was concerned such questions about her health would affect the election, as the polls have tightened, Mrs. Clinton said, "I'm not concerned about the conspiracy theories". The doctor said the incident Sunday was a result of dehydration and overheating and that the candidate is "re-hydrated and recovering nicely".

Trump's gastroenterologist, Dr. Harold Bornstein, wrote a four-paragraph letter claiming Trump would be "the healthiest individual ever elected to the presidency".

Since then, the doctor has told NBC News that he wrote the letter in about five minutes, saying he was "rushed" and "anxious" as a limousine was awaiting him.

Katie Packer, a GOP strategist, said the incident will increase attention on the health of both Clinton, 68, and Trump, 70.

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