Tripura Governor Tathagata Roy, who stirs up quite a controversy with his tweets, got into a major spat on Tuesday with Trinamool Congress lawmaker Derek O'Brien. The Governor who was with Bengal BJP has had many a run-ins with the Trinamool but the latest provocation was the government denying permission to the event of Rashtriya Swayamsevak Sangh chief Mohan Bhagwat in Kolkata in October.