Senator Pauline Hanson must be grateful to Senator Brandis. He declared that every one has the right to be a bigot.
Pauline Hanson is a bigot, and she revels in it. Her bigotry is accompanied by ignorance, which makes her public utterances ugly and dangerous, because bigotry is as contagious as the plague.
Pauline Hanson has made inflammatory statements about Islam: statements which were not only offensive but also plain wrong. Here is a brief summary of some of the things she has said about Islam FactCheckHanson
And here is a link to a detailed fact check.
It is easy to discount Pauline Hanson as a joke: but a lot of people are not laughing: they are lapping up all her anti-Islamic sentiments because they need an easy hate-target. We have seen the same phenomenon before. It is always ugly, and it always turns out badly.
And just in case you are wondering: I am not a Muslim; I do not adhere to any religious tradition. I think that some of the conspicuous Christians in our Parliament (Abbott, Morrison, Turnbull …) have grotesquely distorted ideas of Christian doctrine, and have betrayed the religion they profess to observe). Likewise, Muslim extremists debase the religion they claim to observe. I am opposed to all extremism, whether it is based on religious or political or other ideology.