One Nation Senator Malcolm Roberts is fond of making a grand show to public servants in Senate estimates hearings about the importance of transparency and showing empirical evidence to back up sound policy on climate change, but when it comes to the issue of his citizenship, we are expected to take his word for it. He has released a statutory declaration claiming that he has renounced any Indian and British citizenship (he was born in India to a British father) but he is refusing to follow the lead of other politicians in releasing the documents proving it. He claims he is concerned that the documents will be manipulated. Sounds legit.

BuzzFeed News yesterday published documents that appeared to show that Roberts had traveled on a UK passport in the mid-1950s as a child. His claim he had renounced his citizenship is also contradicted by a statement his former staffer Sean Black gave to Guardian Australia last year that the senator had only ever held one citizenship.