Scrutiny into ministerial expense claims continues, with four ministers billing taxpayers thousands of dollars while attending a 2015 New Year's Eve party hosted by Prime Minister Malcolm Turnbull. Those ministers are Peter Dutton, George Brandis, Mitch Fifield and Simon Birmingham. A further 18 ministers did not claim any expenses for attending the event. The revelation comes after Sussan Ley was forced to stand aside as health minister, pending an investigation into her travel entitlements. South Australian crossbench Senator Nick Xenophon is vowing to re-introduce legislation he first drafted in 2015 to overhaul rules about expenses. He says he was convinced to drop the legislation after the major parties promised that a review into the Brownyn Bishop 'Choppergate' scandal would produce real results. But, with little progress made on recommendations from the review, and with continuing reports of questionable expenses claims, Senator Xenophon says it's time to restore the public's faith in politicians.