Bengaluru, June 9 -- A viral audio controversy involving senior Congress leader Zameer Ahmed Khan has added a fresh twist to Karnataka's Cabinet expansion exercise, triggering intense political speculation over his exclusion from the first list of ministers and sharpening the battle for berths in the ruling party.

The controversy centres on an audio clip purportedly featuring a conversation between Zameer and local Congress functionary Mohammed Siraj during the Davangere South by-election campaign.

The recording allegedly suggested that voters unwilling to back the Congress candidate could be mobilised in favour of another candidate, prompting allegations of anti-party activity from sections within the Congress.

The clip has since snowba...