No, they can ask, and hopefully all the officials will politely decline.
I had more of an issue with 4 senators "demanding" a meeting with the PM, I really wish he'd declined it (he originally did) but I guess he thought that would be viewed as "having something to hide". But I couldn't help thinking what reaction there would have been had 4 MP's demanded a meeting with the US President during a State visit....short shrift I'd bet.