The Leader of Opposition in West Bengal Assembly Suvendu Adhikari on Thursday said Chief Minister Mamata Banerjee-led state government launching a separate portal for COVID vaccination 'Benvax' instead of 'Cowin' is illegal. Briefing mediapersons here, Adhikari said, "I have written about the COVID vaccination scam in the West Bengal to Union health Ministry. The Union Health Minister told me that State Government has sent an interim report. A copy will be sent to me. There is only one vaccination portal - Cowin. But, the West Bengal Government has initiated a separate application namely 'Benvax'. It is illegal. I have complained in this regard to the Union Health Minister. He accepted and ordered an inquiry."