US Republican presidential candidate Donald Trump has pledged to release details about his health after his Democratic rival Hillary Clinton was diagnosed with pneumonia.
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.
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.
She was taken to her daughter's flat in New York's Flatiron building and re-emerged later on Sunday, telling reporters: "I'm feeling great. It's a beautiful day in New York."
Mrs Clinton had been due to leave for California on Monday morning for a two-day trip that included fundraisers, a speech on the economy, and an appearance on the Ellen DeGeneres Show.
Her personal physician, Dr Lisa Bardack, said Mrs Clinton had "been experiencing a cough related to allergies. On Friday, during follow-up evaluation of her prolonged cough, she was diagnosed with pneumonia. She was put on antibiotics, and advised to rest and modify her schedule".
She then left for her home in Chappaqua, New York.
Mrs Clinton suffered a coughing fit last week at a campaign event in Cleveland, Ohio, which fuelled speculation about her condition.
Last month, Dr Bardack said in a letter that the candidate was "in excellent health and fit to serve as president of the United States". She had made a full recovery from surgery she underwent in 2012 for a blood clot, the doctor added.
But Mr Trump has repeatedly suggested she is unfit, telling supporters last month she "lacks the mental and physical stamina" to serve as president.
"I don't know what's going on. I'm like you, I see what I see," he said after Mrs Clinton's pneumonia diagnosis was confirmed.
George HW Bush once vomited on a Japanese prime minister. His son fainted in the White House after choking on a pretzel. Franklin Roosevelt hid his serious health conditions, and John F Kennedy never spoke of his debilitating back condition.
The difference between these men and Hillary Clinton, however, is that her "overheating" episode – the apparent result of a case of pneumonia – comes in the home stretch of a presidential campaign where she seeks to tie Ronald Reagan as the oldest person ever elected to a first term as president.
Then there are the conspiracy theories about her health – some advanced by top Trump campaign surrogates – which will become more frenzied. The campaign's decision to reveal Mrs Clinton's pneumonia diagnosis only after her very visible struggles two days later will certainly complicate matters.
Donald Trump, age 70, is not clear of medical concerns of course. The only information on his health comes from a haphazardly written note from his doctor.
Sunday's episode may keep Mrs Clinton off the campaign trail for a few days, then fade away. People who would otherwise have shrugged off her health rumours, however, are now watching her activity more closely.
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