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Hillary Clinton has been compared to a "robot" again after she didn't budge when a fly landed on her during the US Presidential Debate .

The fly's presence during the Democratic candidate's showdown with Republic candidate Donald Trump set the internet alight and triggered a flurry of commentary and memes from viewers on social media.

There were even suggestions the fly was operated by the Republican Party as an attempt to distract Clinton from the debate.

Some viewers took to Twitter to reassure everyone else the fly was on Clinton, and not their television, given the politician had not moved an inch.

(Image: Getty)

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It even spawned its own Twitter account called Hillary's Fly, tweeting under the account name @FliesForHillary.

"Showing my support for Hillary! I can't believe I'm on TV!" the account tweeted.

A Twitter user named Schmidtz said: "Hillary" didn't react to that fly landing on her forehead.

In a tweet which went viral, a blooger known as @KFCbarstool said: "Hillary has been disqualified.

"You need to be 35 yrs old, an American citizen, and also not a robot who lets flies crawl on their eyeballs."

It is not the first time Mrs Clinton has been compared to a robot.

A bizarre video of her eyes moving in different directions sparked outlandish theories that she was actually a robot last month while speaking to Temple University students in Philadelphia, Pennsylvania.

She also was compared to a robot after she was spotted 'clapping like a seal' as Bernie Sanders spoke on her behalf at a rally on September 30.