Karnataka Chief Minister Siddaramaiah, accompanied by cabinet colleagues and close aides, is headed to Delhi, sparking a huge political buzz that a change in the state leadership is on the cards. The subject of discussion for the Delhi meeting, the 77-year-old Chief Minister said, is not known to him. "I have been summoned to Delhi. I don't know the subject of discussion. I have meeting scheduled at 11am (Tuesday). Speculation will always be there," the Chief Minister said, hinting at the leadership tussle between him and his Deputy, DK Shivakumar. Deputy Chief Minister DK Shivakumar has not been invited to the Delhi meeting. "Will go to Delhi if high command calls. Not my job to comment on Chief Minister change," DK Shivakumar said, reacting to the buzz.