Sinodinos won't front Senate inquiry

Cabinet Secretary Arthur Sinodinos won't front a parliamentary inquiry into entities donating to political parties, despite the Senate directing him to.

Senator Sinodinos' office confirmed he would not appear before Thursday's Senate inquiry, established by Labor earlier this month with a provision that he would be called.

The senator was the NSW Liberal Party's treasurer and finance director when secret donors poured $700,000 into the party's coffers ahead of the 2011 state election.