It came amid intense speculations that a possible political realignment was being planned, with several political parties, including the opposition, holding meetings on Sunday.

The PH coalition comprising Mahathir's PPBM, the Democratic Action Party (DAP), Parti Keadilan Rakyat (PKR) and Parti Amanah Negara, took power after the national polls in May 2018, defeating the Barisan Nasional (BN) coalition led by United Malays National Organization (UMNO), which ruled the country since 1957 until 2018.

Mahathir himself headed the UMNO and BN as Malaysia's Prime Minister from 1983 to 2004.

Shortly before Mahathir's resignation on Monday, PPBM President Muhyiddin Yassin said the party was leaving the PH coalition with the party's supreme council making the decision.

"All members of the House of Representatives of the party are also out of Pakatan Harapan. All of them have signed the oath to continue to support and trust Mahathir Mohamad as Prime Minister of Malaysia," the PPBM president said.

However, Finance Minister and DAP secretary-general Lim Guan Eng, who met Mahathir on Monday shortly before his resignation, said Mahathir had resigned due to his principles, refusing to work with the UMNO or form a "back-door" government through undemocratic means.

Lim said his party will continue to support Mahathir as the prime minister, blaming "renegade and treacherous" elements for attempting to form a government through the back door.

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