First, we are given that right in the constitution for a reason.
Second, even if she remains silent, let them prove it without her speaking because AGAIN for the nth time the burden of proof is with them.
Third, silence does not necessarily mean guilt. Where did you get that? What if she is just tired of answering all the scandals and intrigues hurled at her from the beginning of her presidency? It is true that a fish is caught by its mouth probably that's why she is evading the lure of the opposition coz she might be caught by their hook.
Fourth, I believe the President already promised to give her statement in due time. Let us respect that.
So what is all the oppositions big rush and fuss about?! If you're gonna ask me their just POWER-HUNGRY.