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Some have even suggested that the earpiece allowed the Democrat’s team to help her out during the clash. Others have said it could be a mystery medical device.

Conspiracy theorists claim to have spotted Mrs Clinton wearing a secret earpiece during the presidential debate on Monday September 26.

Conspiracy theorists have claimed Hillary Clinton wore an earpiece during the presidential debate

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Did Hillary Clinton wear an earpiece in the US debate?

Close-up photos of Mrs Clinton allegedly show that she was wearing a hidden earpiece during the clash with her rival Donald Trump.

“What is it for?” the Catholic Online website asked. “Is it so a team can feed her answers? Is it an anti-seizure device? A hearing aid?”

A separate image circulating on Twitter shows what appears to be a wire running down Mrs Clinton’s back and leading to a larger box.