The Independence Day tiff between West Bengal Governor Jagdeep Dhankhar and Chief Minister Mamata Banerjee escalated on Sunday, with Mr Dhankhar accusing the state government of placing Raj Bhavan - his official residence - under surveillance and "undermining the sanctity" of the institution. "I would like to tell you all Raj Bhavan is under surveillance. It undermines the sanctity of the Raj Bhavan. I will do everything to protect its sanctity," Mr Dhankhar said at a press conference in Kolkata today.