Federal Labor is demanding Cabinet Secretary Arthur Sinodinos front a parliamentary inquiry into political donations, saying he shouldn't hide from questions.
Senator Sinodinos is refusing to appear before today's Senate inquiry, established by Labor earlier this month with a provision that he be called.
The opposition says Senator Sinodinos has publicly stated he has nothing to hide so he should front up, suggesting failure to appear will only raise further questions about his fitness to hold office.
The NSW Electoral Commission is refusing to pay the Liberals more than $4.4 million until it reveals the secret donors.
