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Online conspiracy theorists believe they have found further evidence that Hillary Clinton is secretly seriously ill - or, in fact, a ROBOT.

The US presidential hopeful sparked yet more concerns for her health after she was spotted 'clapping like a seal' as Bernie Sanders spoke on her behalf at a rally.

Footage appears to show the 68-year-old looking tired and applauding robotically during her former rival's speech at the University of New Hampshire.

Eagle-eyed observers were quick to take to Twitter to comment on the Democratic nominee's apparent bizarre behaviour.

One user wrote: "I’m listening to Bernie speak and watching Hillary clap like a robot."

Another added: "Watch this video, it proves Hillary IS a robot: Hillary just keeps clapping and clapping…"

It is not the first time the internet has buzzed with outlandish suggestions that Clinton may be a robot.

(Image: REUTERS) (Image: Getty)

Last week, video emerged appearing to show the former Secretary of State's eyes moving in different directions .

The candidate was speaking to Temple University students in Philadelphia, Pennsylvania last Monday.

But as she addressed her audience, her eyes appeared to be out of sync, especially as she looked to the left.

On Twitter, many users were open about their bizarre views, with one person simply writing: "I think Hillary Clinton is actually a robot."

(Image: Rex)

Another added: "So apparently Hillary Clinton is dead and she's been replaced with [a] robot."

The far-fetched conspiracy theories appear to stem from a tongue-in-cheek interview Hillary gave with Buzzfeed podcast 'Another Round' back in 2015 when a reporter noticed that she did not sweat.

Hillary said: "You guys are the first to realise that I'm really not even a human being. I was constructed in a garage in Palo Alto a very long time ago."

She then added: "I've seen more people that kind of don't sweat, and other things, that make me thing maybe they are part of the new race that he created: the robot race."

(Image: AP)

Jokingly, she warned the reporter: "But you have to cut this, you can't tell anybody this. I don't want anybody to know this. This has been a secret [...] and I'm just spilling my electronic guts to you."

While the conspiracy theories are completely ridiculous, Clinton has faced a barrage of criticism over her health over recent months.

And some believe that the clip of her rolling eyes could be a sign of underlying health issues.

(Image: Getty)

Donald Trump consistently uses rhetoric at his rallies, claiming that Clinton does not have the "stamina" to be president.

This all feeds into the rumours that have dogged Hillary regarding her health - one example of a rumour is that she has Parkinson's disease.

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But some on the Republican side of the house have gone further than that, claiming that her health is in serious decline.

Even the former Mayor of New York City is convinced.

(Image: Getty Images)

Rudy Giuliani appeared on TV recently and said: "All you got to do is go online.

"Go online and put down 'Hillary Clinton, illness' and take a look for yourself."

However, Hillary's doctor says she is "healthy and fit to serve".