Malcolm Turnbull appears determined to maintain his silence on whether he contributed more than $2 million to the Liberal Party to help his re-election effort. Significantly, he hasn't denied it.

But due to the archaic laws governing political donations at the federal level, we must wait until February next year before the Australian Electoral Commission publishes the disclosures of political parties and candidates.

There is absolutely nothing wrong – or maybe even surprising – with the decision to inject a large amount of cash into a campaign in which you are seeking to be re-elected as prime minister.

The Prime Minister is enormously wealthy – worth an estimated $200 million – and it's all perfectly legal, of course. But therein lies quite a big problem.