Attorney-General Christian Porter has appointed one of his own ex-staffers to a plum job on the Administrative Appeals Tribunal just two months after the former adviser left his office.

Mr Porter last week appointed William Frost, a lawyer and his former senior adviser, to a seven-year, full-time position on the review tribunal, a position that pays up to $244,520 a year.

Attorney-General Christian Porter. Credit:Dominic Lorrimer

Among the other 34 new appointments to the tribunal were several former Liberal MPs such as Bob Baldwin, former Senate president Stephen Parry and Joseph Francis, formerly a Liberal minister in Mr Porter's home state of Western Australia.

The West Australian revealed on Monday that Mr Francis' Australian Transit Group lent Mr Porter a campaign bus - nicknamed the "Porter Transporter" - on a "complimentary" basis, though Mr Porter said he had nothing to do with those commercial arrangements.