"What has been agreed upon is only a convention. There is no such provision in the constitution," he told a press conference Sunday.
"We don't elect leaders unconstitutionally, we elect leaders based on procedures."
Muhyiddin, who has called for Abdullah to stand down before his planned departure in 2010, said the party must address internal conflicts and the opposition threat. (Read - Malaysiakini - Muhyiddin attacks power transfer plan, again).
Abdullah has defied calls (read latest here, here, here and here) to quit despite being confronted by rare criticism from within his cabinet, (read here) as well as a challenge from opposition leader Anwar Ibrahim who says he has enough defectors to topple the government.
"It is a situation which is very serious. It is of concern not only to Umno members but to the country at large, to the Barisan Nasional and people who cares about what is happening to the government," he told a press conference.
"If nothing happens then I am not too sure if the lifespan of Barisan Nasional, of Umno in particular, can sustain beyond the year 2013," he said, referring to the scheduled date of the next general election."
Read Bigdog's entry: Muhyiddin ‘berseorangan’ diatas, tetapi mewakili aspirasi akar umbi here.