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She was scheduled to travel to California this week to appear at two fundraising events and on the Ellen DeGeneres television show. However, the 68-year-old was forced to leave a 9/11 commemoration service yesterday suffering from a “medical episode” and has now cancelled her arrangements on the West Coast. The US presidential candidate has now said she will release additional medical records this week after claims she was being overly sercretive on her health. Press Secretary Brian Fallon announced that Clinton would release the medical records. He added tht the campaign had made mistakes on dealing with the situation on Sunday. The 68-year-old has been forced to cancel a fundraising trip to California after nearly collapsing at a 9/11 memorial event . A video has emerged of the Democratic presidential nominee in which her "knees buckled" as she left the commemorative event. She was then helped into a van by security staff.

Mr Fallon said that the campaign had specifically not responded to questions for 90 minutes about Clinton's exit from the memorial event. It has now been revealed by her doctor she was diagnosed with pneumonia on Friday. Lisa Bardack, the former first lady's doctor said: “Secretary Clinton has 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. “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."

GETTY•IG Hillary Clinton was pictured wearing dark sunglasses at the 9/11 ceremony today

Her campaign team said she had been "overheated" but was now feeling "much better". Last year, Clinton released a summary of medical reports and testing but until now has refused to release more. Now Clinton has decided to release further records. US journalist Rick Levanthal, of Fox News, said: “She unexpectedly left early because of what appeared to be a medical episode.

FOX NEWS Mrs Clinton being helped away from the 9/11 ceremony

GETTY Clinton left the 15th anniversary memorial unexpectedly early today

"I have a law enforcement source who was there, who was 15 feet away form Hillary Clinton. He said she was standing on a curb with her protective detail waiting for her motorcade. "They were surprised to see her because she wasn't meant to be leaving yet. "When it finally rolled up my source said she stumbled off the curb, appeared to faint, lost one of her shoes, which wound up under the van.

YouTube Hillary Clinton was seen leaning against a post and swaying before being helped into a car

She arrived at the event at 8.18am local time and left around 90 minutes later. Mr Levanthal continued: "The protective detail helped her into the van and the van took off, presumably in the direction of the hospital. "They grabbed her shoe, flagged down the rest of the motorcade and this was given to her protective detail.

"It's not terribly hot today. It was certainly warm at the scene. "But again, Hillary Clinton, who my source was 15 feet away from, said she appeared to be having some sort of medical episode." Journalists who attempted to follow her were barred from leaving the press area at the ceremony.

GETTY Mrs Clinton at the ceremony before being forced to leave due to feeling "overheated"

The Clinton campaign said she felt "overheated" but is now doing "much better". She was later pictured smiling and waving to photographers as she left the apartment following a short rest. As she left, she told bystanders: "I feel great! It's a beautiful day in New York!" Republican candidate Donald Trump wished Mrs Clinton a speedy recovery on Monday but used the incident to jump on her health record after suggesting for weeks she lacks the energy needed to be president. Speaking to Fox News, Mr Trump said: "I hope she gets well soon and gets back on the trail... and we'll be seeing her at the debates. "We have to see what's wrong. Whatever it is, I'm ready."

GETTY Mrs Clinton waving to bystanders as she left her daughter's apartment following the incident yesterd

The 70 year old businessman said he would soon release detailed information about his health. Asked about the health of both candidates, Mr Trump, added: "I think it's an issue. "In fact this last week I took a physical and when the numbers come in I'll be releasing very, very specific numbers." A statement released by Mrs Clinton's campaign said: "Secretary Clinton attended the September 11th Commemoration Ceremony for just an hour and 30 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."

GETTY Mrs Clinton said she was "feeling great" following her medical episode