[6] In 2001 and 2010, Thomas represented Pan-Malaysian Islamic Party (PAS)-led Terengganu and Kelantan governments in two separate lawsuits against Petronas over its failure to pay state oil royalty.

[19] Thomas had previously represented Chin Peng, the leader of the Communist Party of Malaya (CPM), in a failed appeal to the government to allow his body to be buried in his hometown, Sitiawan.

[21] Subsequently, another petition was launched to urge the Agong to remove him from attorney general due to his poor command of the Malaysian language in wake of his request to the court that he be allowed to proceed in English when leading a prosecution against former Prime Minister Najib Razak.

[23] Previously, Thomas had suggested that he could have been attorney general for just a single day, due to Tun Dr Mahathir Mohamad's concern about the "scale and magnitude of the Malay opposition" to his appointment.

[26][27] The different treatment towards the two suspects was perceived as discriminatory practice in the Malaysian judiciary system as the court had found a prima facie case against both Siti Aisyah and Doan.

[28] Ramkarpal Singh, the Malaysian Member of Parliament for Bukit Gelugor, stated that the refusal to withdraw the murder charge against the second suspect was "mind boggling and raises questions about the powers of the Attorney General".

[33][34] Launched simultaneously in 2016, both books contained collections of essays he had written over the past 34 years on the Federal Constitution, law, politics and economics and that had been published by online portals and by the Malaysian Bar.