Bersatu says the government to be formed by Anwar Ibrahim is not a unity government as Perikatan Nasional (PN) is not part of it.
Bersatu deputy president Ahmad Faizal Azumu said PN which he described as the coalition representative of the Malays, was not part of the government to be formed between Pakatan Harapan (PH) and Barisan Nasional (BN).
"Anwar became prime minister not with the support of the majority, but through political arrangements with BN despite his campaign promise to the people that he would not join forces with BN which is embroiled in scandals and corruption.
"This is unlike Muhyiddin Yassin who refused to work with Zahid or drop the corruption charges against him during his time as prime minister," he said in a statement.
The proposal for a unity government was made by Yang di-Pertuan Agong Sultan Abdullah Sultan Ahmad Shah in order to break the political impasse following the results of the 15th general election.
Gabungan Parti Sarawak, which initially threw its support behind PN, said after an audience with the king that it would comply with Sultan Abdullah's decree.
Umno meanwhile said it would support the proposal for a unity government but not one led by PN.
The palace, in announcing the king's consent for Anwar to be made the prime minister, had made no mention of a unity government in its statement.