On 21 January 2021 he formed his party Indian Secular Front which will be contesting in the 2021 West Bengal Elections. Initially they planned to join hands with AIMIM leader Asaduddin Owaisi.[6] However, that plan faltered[7] and instead he joined hands with the Left Front (comprising various communist parties) and the Congress to form the Sanjukta Morcha. His party Indian Secular Front contested on a borrowed symbol from Rashtriya Secular Majlis Party (RSMP) which is a Bihar-based party.[8]
In 2021, Siddiqui called for beheading as punishment for disrespecting the Quran.[9]