Susanna Koh says she has no confidence in the reconstituted task force as three of its members have conflict of interest issues.
Secretary of State Mike Pompeo will continue to press the Saudis on Khashoggi's murder when he visits Riyadh next week as part of an eight-country tour of the Middle East.
Many questions have remained unanswered by the Saudi authorities.
There have been concerns that the devices could have been tampered with or hacked into to skew the result.
Criminal lawyer Manjeet Singh Dhillon says it would be tricky to rely on ex-cops Azilah Hadri and Sirul Azhar Umar to give evidence for the prosecution as their credibility could be questioned.
Umno Minister Mustapa Mohamed says if election held during wet season, it may dampen voter turnout, and consequently, hurt credibility of election result.
Counsel Gurdial Singh Nijar and Sivarasa Rasiah submit that Abdul Murad Khalid had made a malicious and false allegation against the former opposition leader.
Lawyers for Mahathir and Anwar want Abdul Murad Khalid and another witness to be recalled so that they can be questioned over claims they had made.