A day after joining the Bharatiya Janata Party (BJP), ex-Karnataka chief minister and former Union External Affairs minister SM Krishna on Thursday praised Prime Minister Narendra Modi and said he is impressed that the prime minister has zero tolerance towards corruption.

"PM Modi has zero tolerance towards corruption. I was impressed with this. I also supported the demonetisation move," the veteran leader was quoted as saying by a news agency.

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Unhappy with the Congress party, Krishna said he doesn't see any seriousness in the party leadership. "The Congress needs to be rebuilt from the ground to the top, but I see no seriousness in the leadership," he said, adding, "There is no connect between the Congress leadership and the rank and file of the party."

On Wednesday Krishna formally joined the BJP at its headquarters in New Delhi in presence of party chief Amit Shah.

The veteran political leader worked for over four decades with Congress and resigned from the party on January 29 this year, after claiming that the party was in a state of confusion.