Jailed former opposition leader Anwar Ibrahim has described the move by Dr Mahathir Mohamad to form a new party as a positive step.

"We are waiting for (former deputy prime minister) Muhyiddin (Yassin) to decide because Muhyiddin is making the decisions.

"We look forward to engaging with them. I think it's a positive thing," Anwar said when met at the court complex this afternoon after two of his cases came up for decision.

Anwar also stressed on the importance of a united opposition, and lauded PAS deputy president Tuan Ibrahim Tuan Man’s call for a ceasefire.

The opposition, he said, must stay united and soldier on for the time being.

"We must consolidate and work. It is time we must consolidate," he added.

Welcoming Tuan Ibrahim's call for a ceasefire among opposition parties and to find a common feature and work on it, Anwar said this was a positive statement from the PAS leader.

"I think we look forward to engaging with them," he said.

Earlier in court, there were scores of PKR and Pakatan Harapan supporters, and among them include PKR vice-presidents Nurul Izzah Anwar, Tian Chua and Shamsul Iskandar Mohd Akin and Amanah secretary-general Mohd Anuar Tahir.

Anwar had previously penned a scathing letter, warning PKR leaders on the dangers of working with former prime minister Mahathir.

Mahathir had in 1998 sacked Anwar as deputy prime minister.

PAS left the opposition Pakatan Rakyat pact last year. Now the new opposition coalition, called Pakatan Harapan, consists of the newly-formed Parti Amanah Negara, DAP and PKR.