Johor state assembly speaker Mohd Puad Zarkashi has volunteered to sue Dr Mahathir Mohamad over Malaysia's loss of Pulau Batu Puteh.<br /><br />Puad is taking up a challenge by Johor Menteri Besar Onn Hafiz Ghazi on Sunday for legal action to be taken against the "betrayal" that caused the country to lose the rocky outcrop to Singapore.<br /><br />Puad said today that even though Onn Hafiz did not name anyone, everyone knew that Mahathir was responsible.