UMNO Supreme Council member Datuk Seri Mohamed Nazri Abdul Aziz today asked Tan Sri Muhyiddin Yassin to step down as UMNO deputy president if he could no longer discharge the responsibilities entrusted on him.

He said the UMNO Constitution clearly stated that the task of a deputy president was to assist the party president.

"It is an offence if the deputy president performs any act in contrary to his duties," said Mohamed Nazri, who is also Minister of Tourism and Culture.

According to Mohamed Nazri, Muhyiddin was wrong in saying that UMNO secretary-general Datuk Seri Tengku Adnan Tengku Mansor did not take action against him because there was no proof.

"Before the last UMNO General Assembly, he (Muhyiddin), along with former prime minister Tun Dr Mahathir Mohamad organised a meeting to bash UMNO president Datuk Seri Najib Razak.

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"Now, he still questions issues such as on the RM2.6 billion donation which case was announced closed by the Attorney-General, and the issue on the 1Malaysia Development Berhad (1MDB), which is still being investigated by the Public Accounts Committee," he told reporters during a working visit here today.

All these, he said, clearly showed that Muhyiddin was not with the party president, and that his actions should not be sanctioned.

"Muhyiddin also no longer performs the tasks as expected by delegates who voted for him for the post," he added.

If Muhyiddin refused to step down, Mohamed Nazri said, he would propose for the latter's party membership to be suspended when the UMNO Supreme Council meet for its next meeting.