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An ex-secret serviceman who spent years guarding Hillary Clinton has lifted the lid on her 'fainting' episode.

The former first lady shocked the US political world after footage emerged of her being taken ill after a 9/11 memorial service .

The 68-year old told people she was suffering from pneumonia and cancelled a two day tour of California.

But Gary Byrne, who spent 29 years in secret service, says there is something more serious afoot - and claims the presidential favourite displayed the symptoms of a seizure.

Mr Byrne analysed the footage exclusively for the Mirror Online because the "people needed to know the truth".

(Image: Getty Images)

He said: "Her posture is very rigid - she's almost back on her heels and if you watch her her head actually lifts up and you can see this rigid posture.

"Clearly the two staff members - one standing behind the other - the front one is clearly still controlling Mrs Clintont.

"The shift leader, the bald guy, walks right in front of Mrs Clinton.

"Now typically the shift leader or agent would never walk in front of the protectee as they're getting into a vehicle, because you're blocking their path.

(Image: YouTube/Zdenek Gazda)

"But the reason he is doing it is because he knows she can't move under her own power.

"He's going to come around and he's going to take her right arm - and watch what happens to Mrs Clinton.

"It's sad to watch but she starts to fall and of course they catch her."

In their rush to get the presidential hopeful away from the scene, they leave one of her shoes behind.

He adds: "The fact that they're waiting out in the open like that where her only protection are her against waiting on the vehicle - that's a significant thing too. They wouldn't normally do that.

(Image: Getty Images)

"And they're doing it because they want to get out of the public eye and they want to get her medical treatment."

Mr Byrne says the slick behaviour of her security detail suggest they knew that there was something very wrong with her and they were prepared.

He is also worried by the fact he was whisked away to her daughter's apartment - she is being treated by her own private medical specialists in secret.

He described Mrs Clinton as "a very sick person who couldn't control their movements".

He said: "I've seen quite a few seizures unfortunately in my time...she was panting out and her body completely collapses.

"Now I'm not a doctor, but what I see there is Mrs Clinton completely rigid as if she was having a seizure."