Digging up dirt on Dr Mahathir Mohamad is not a wise strategy, warned a Johor Umno leader.

Likening it to a game of strip poker, Kempas assemblyperson Tengku Putra Haron Aminurrashid Jumat said for each time someone uncovered something about Mahathir, the former premier would hit back with something worse.

"In a poker game, it is not wise to play with a person who has unlimited capital of the same currency...In 22 years at the helm of the country, one will definitely have gathered enough chips to play a lifetime of poker...