Application to release and pardon Anwar was one of the six pledges of PH GE14 manifesto.
PKR vice-president Sivarasa Rasiah who was also present said the visit to the hospital where Anwar was being treated was to discuss party matters.
Mahathir sacked Anwar in 1998 over political differences, and he was subsequently jailed on charges of sodomy and abuse of power, in a case widely condemned as politically motivated. He was already slated to come out of prison in June.
Newly minted Prime Minister Tun Mahathir Mohamad told a press conference on Saturday that there is a process to be followed but that it would be "expedited as soon as possible".
Sinar Harian reported that local and global media had started gathering since 12pm at the Cheras Rehabilitation Hospital, where Anwar is now being held.
Malaysia's deputy prime minister-designate Wan Azizah Wan Ismail said on Friday her husband Anwar Ibrahim could be released from custody within days, and be granted a full royal pardon hopefully within a week.
A video of Anwar watching from his hospital room the swearing-in ceremony of Dr Mahathir as prime minister on Thursday went viral on social media.
However, Anwar will have to win a by-election or be elected senator in order for him to take over as prime minister.
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