Former prime minister Dr Mahathir Mohamad said a slight nudge could bring down three BN state governments - Perak, Terengganu and Johor - even before the next general election.

Mahathir said this in reference to Jorak state assemblyperson Shahruddin Salleh who defected from Umno to Parti Pribumi Bersatu Malaysia (Bersatu) earlier this week.