[3][2] On June 7, 2018, Thanigasalam was elected to the Legislative Assembly of Ontario as the Member of Provincial Parliament (MPP) for Scarborough—Rouge Park.

[5] In 2022, Thanigasalam supported the provincial government’s $1 billion plan to revitalize the Scarborough Health Network’s aging infrastructure.

[7] Thanigasalam was re-elected in the 2022 Ontario general election and subsequently named Parliamentary Assistant to the Minister of Infrastructure.

[10] On December 11, 2024, Thanigasalam was acclaimed as the PC Party candidate for Scarborough—Rouge Park for the 2025 Ontario General Election, which is scheduled to take place on February 27, 2025.

The bill recognizes how Tamil-Ontarian families "have been physically or mentally traumatized by the genocide that the Sri Lankan state perpetrated against the Tamils during the civil war which lasted from 1983 to 2009, and especially so in May 2009.

Talking of his own childhood experiences during the war; Thanigasalam stated that the passage of the bill into law "would help the Tamil-Canadian community start the healing of wartime trauma and assure them one government understands their pain".