Motoring Enthusiast Senator Ricky Muir has lost his second chief of staff in three months after Sarah Mennie quit on Friday.
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Ms Mennie had previously worked for independent senator Nick Xenophon and the head of the Fair Work Building and Construction commission, Nigel Hadgkiss.
Her exit comes after the so-called "preference whisperer", Glenn Druery, was sacked by Senator Muir in August.
At the time, Mr Druery blamed his exit on Australian Motoring Enthusiast Party founder Keith Littler, who he accused of plotting to take Senator Muir's seat in Parliament.
Another staffer, Susan Bloodworth, quit in protest at Mr Druery's sacking. And just days later another staffer, Peter Breen joined the exodus as Senator Muir's office imploded.
Ms Mennie only joined Senator Muir's office in July. It is understood that she will be returning to work for Mr Hadgkiss and that there is no ill-will towards the Victorian Senator.
Ms Mennie declined to comment when contacted by Fairfax Media.
Mr Littler, a truck driver from Queensland who produces motor sport videos, has moved to Melbourne with his wife Sharyn, to steer his electorate office.