Kellyanne Conway has faced ridicule on social media for a tweet she posted five months ago that poked fun at Hillary Clinton's email saga.

The senior adviser to Donald Trump took a swipe at the Democratic presidential nominee on Twitter shortly before the election when James Comey, the FBI director, announced new emails were being investigated.

The new trove, which was found on the laptop of the husband of Huma Abedin, a top Clinton aide, revived the scandal three months after the FBI announced after an 11 month inquiry that criminal charges were not warranted.

"Most honest people I know are not under FBI investigation, let alone two," Ms Conway tweeted in October 2016, sharing a Fox News tweet quoting her as saying in an interview about Mrs Clinton, "If you’re under your 2nd FBI investigation in the same year then you do have a … corruption & an ethics problem.”