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The Democratic candidate has resumed campaigning with a rally in North Carolina four days after she collapsed at a 9/11 memorial. She told crowds that she “thought she could power through” her illness, and admitted she should have revealed the diagnosis sooner. Clinton’s doctor released a letter detailing her medical history, which revealed she underwent secret surgery and brain scans earlier in the year. It was reported that the Democratic party were “considering” a replacement for Mrs Clinton amid the health scare, leading to fears that her illness could be worse than has been reported. Her Republican rival, Donald Trump, has repeatedly claimed that she is "sick and tired" and "not strong enough to be president", adding fuel to rumours that she is suffering from a mystery illness. If Clinton wins the election, she will be the second-oldest president to take office at 69 years old. Trump would be the oldest at 70.

Why did Donald Trump say Hillary Clinton is sick? Trump claimed that Clinton is not healthy enough to take on the presidency at a rally earlier this month. He said: "She lacks the mental and physical stamina to take on ISIS and all of the many adversaries we face, not only in terrorism, but in trade, and every other challenge we must confront to turn our great country around." His campaign team have mirrored the allegations. John Jaggers, Trump's Northern Virginia and Maryland state director, suggested that Clinton would be dead within a year of taking the presidency.

GETTY / AP Donald Trump has claimed that Hillary Clinton isn't well enough to serve as president

GETTY Clinton will become the second-oldest president to take office if elected

"This woman is very, very sick and they're covering it up," he said. "You're not so much talking about Hillary Clinton being president for eight years – you're talking about Tim Kaine being president for eight years," he added, referring to Clinton's running mate. Jaggers was co-opting a conspiracy theory that emerged after Clinton wore a long wool coat to an event in sunny Nantucket, Massachussets. Some suggested that the unseasonable outfit was hiding medical devices that were treating a mystery illness. IS CLINTON OR TRUMP AHEAD IN THE POLLS?

A Fox News presenter made similar accusations and referred to an incident where Clinton collapsed in 2012. The then Secretary of State suffered mild concussion after fainting and hitting her head. She had become dehydrated while suffering from a stomach virus. Sean Hannity said that the collapse, as well as a recent video of Clinton shaking her head erratically, were proof of a "traumatic brain injury". He claimed that her exaggerated movements were caused by a seizure, saying: "What about some of the weird pauses and coughing fits she has? There are moments when I’m literally watching her and her facial expressions are odd."

AP Trump campaigners pointed to this photo of Clinton wearing a coat as proof of her supposed illness

What has Hillary Clinton said about her health? At an event in North Carolina, Clinton told supporters that she was on the mend after her bout of pnuemonia. Her physician, Dr Lisa Bardack, declared Clinton fit for the presidency, and confirmed she had placed the former First Lady on a 10-day course of antibiotics. Clinton's camp had categorically denied that she is ill prior to the pneumonia diagnosis. The 68-year-old appeared on Jimmy Kimmel Live! to debunk the "deranged conspiracy theories" personally, jokingly opening a pickle jar as proof of her wellbeing. She said: "On the one hand it's part of the 'wacky strategy' – just say all of these crazy things and maybe some people will believe you. "On the other hand it makes no sense. I don't go around questioning Donald Trump's health, as far as I can tell he's as healthy as a horse."

Lisa Lerer, a journalist who witnessed Clinton's so-called "seizure", also refuted the sickness claims. The reporter took blame for Clinton's jerky movements in the infamous video, saying the Democrat was simply reacting to the recorder she had thrust in front of her. Clinton released a full medical record in July, 2015, in which her regular doctor of 15 years, Lisa Bardack, affirmed that "she is in excellent physical condition and fit to serve as President of the United States". Jennifer Palmieri, the campaign's director of communications, accused Trump of "using shameful distractions to hide his own record". She said: "Hillary Clinton has released a detailed medical record showing her to be in excellent health plus her personal tax returns since 1977, while Trump has failed to provide the public with the most basic financial information disclosed by every major candidate in the last 40 years.” CLINTON VS TRUMP: WHEN IS THE FIRST DEBATE?

GETTY Donald Trump released a doctor's letter saying he is 'the healthiest individual ever'

What has Donald Trump said about his health? Trump's campaign released a letter from his physician, Dr Harold Bornstein, who claimed to have been treating the Republican for the past 30 years. The "colourful" statement said: "His physical strength and stamina are extraordinary. If elected, Trump will be the healthiest individual ever elected to the presidency." Dr Bornstein wrote that "a recent medical examination showed only positive results". Kurt Eichenwald, contributing editor for Vanity Fair, pointed out that positive results would indicate that Trump was suffering from a host of medical problems. The journalist argued: "No competent or real doctor would write this," negatively comparing the brief statement to Clinton's much more detailed letter.

Donald Trump's most bizarre and uncomfortably awkward quotes Tue, November 8, 2016 Donald Trump business mogul turned political candidate is well known for his off the wall and often offensive quotes; here are some of his most mind boggling quotes from over the years. Play slideshow AFP/Getty Images 1 of 31 A recording of Donald Trump emerged during his campaign of him boasting back in 2005 “I’m automatically attracted to beautiful — I just start kissing them. It’s like a magnet. Just kiss. I don’t even wait. And when you’re a star, they let you do it. You can do anything.” He then went on to say “Grab ’em by the pussy. You can do anything.”