New Delhi, Aug. 11 -- K N Rajanna has resigned as the Karnataka's Cooperation Minister, hours after questioning the Congress party's silence over Rahul Gandhi's "vote chori" allegations against the Election Commission of India.

"Karnataka Minister KN Rajanna resigns from the post of cabinet minister," the Chief Minister's Office confirmed.

He was reportedly asked to resign by Chief Minister Siddaramaiah after he raised questions about the voter list used in the Lok Sabha polls, saying that it was prepared when the Congress was in power.

"If irregularities occurred, then why was no one speaking up at the time? Why did we remain silent?" Rajanna asked reporters, openly challenging his party colleagues.

Earlier, news agency PTI, citing s...