KUALA LUMPUR: Tun Dr Mahathir Mohamad said he feels most betrayed by Tan Sri Muhyiddin Yassin.

"I feel betrayed, mostly by Muhyiddin. He has been working on this for a long time and now he has succeeded," he told a press conference at Yayasan Al-Bukhary on Sunday morning (March 1).

Asked whether he was upset with Datuk Seri Azmin Ali, Dr Mahahtir said Azmin had his own agenda.

"He has this whole agenda and chose to work with Muhyiddin," Dr Mahathir said.

On the next step for Pakatan Harapan, Dr Mahathir said Pakatan would be calling for an urgent parliamentary sitting.

"We will see who has the majority (support of MPs)," he said.

Pakatan will now become the opposition, he added.

On the future of Parti Pribumi Bersatu Malaysia, Dr Mahathir said it was up to the party to decide whether to expel him as chairman or not.

"It is going to happen because majority has rejected me as chairman (of Bersatu).

"They can officially seek and expel (me)," he said.

Asked whether he regretted resigning as prime minister, Dr Mahahtir said he had no other choice.

"I had no choice because when I see the coalition that is going to be formed by Bersatu is with Umno en-bloc.

"That means I would have to accept the people I fought against. That, I am not prepared to do but Muhyiddin was prepared to do so," he added.