Former prime minister Dr Mahathir Mohamad and the Opposition have never seen eye-to-eye when it comes to public rallies - but the two will be sharing the stage in their first-ever rally together.

PKR secretary-general Rafizi Ramli said in a press statement this afternoon that Mahathir has confirmed his attendance at the "Save Malaysia Consensus" rally at the Ampang Jaya Municipal Council (MPAJ) field in Pandan Indah.

"In order to match the schedule of all Pakatan Harapan leaders, Mahathir, (suspended Umno deputy president) Muhyiddin Yassin and other prominent figures, the final date (for the rally) has been set for Monday, March 28, 2016, at 8pm," Rafizi said.

He is the coordinator for the Save Malaysia Consensus secretariat on behalf of the opposition, together with former Batu Kawan Umno division vice-chief Khairuddin Abu Hassan, who is acting for Mahathir.

Rafizi said the rally would see speeches, poems, performances and other programmes.

"It is open to all Malaysians and I urge as many rakyat as possible, who are concerned about the country's future, to spread the waves of reformation," he said.

Bid to remove scandal-plagued PM

Rafizi said the rally is to allow for public participation as another gathering a day before that, organised by former minister Zaid Ibrahim, would be a closed-door affair.

The bi-partisan meeting and rally come following the signing of the Citizens' Declaration initiated by Mahathir.

The declaration brought together a strange grouping as it saw Mahathir and his allies joining forces with the opposition and civil society, who for decades have been opposed to each other.

The Citizens' Declaration seeks to remove scandal-plagued Prime Minister Najib Abdul Razak and also calls for institutional reforms.

Mahathir has in the past scoffed at public rallies by the opposition and even launched crackdown on them when he was prime minister.

He made two brief appearances at the Bersih 4 rally in August last year, which called for Najib to step down, to show his support.

However, Mahathir was not allowed to speak then as organisers from the civil society were wary of the former prime minister, who has been accused of authoritarianism during his rule.