Former senator Hollie Hughes has quit the Liberals but spoken up for Opposition Leader Sussan Ley. Photo: Mick Tsikas/AAP PHOTOS

Opposition Leader Sussan Ley has praised a former Liberal senator who quit the party in disgust over the behaviour of some current MPs.

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Hollie Hughes, who had been booted from her winnable spot on the party's senate ticket ahead of the May federal election, tendered her resignation from the Liberals on Tuesday.

"There are some people who are completely inept, who are lazy, who are not across the details," she told 2GB radio.

"It is an absolute rabble."

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