New Delhi, May 25 (ANI): In a blow to the YSR Congress, one of its party MPs on Sunday joined the rival TDP, which is set to form the government in Andhra Pradesh. A three-time Nandyal MP, SPY Reddy, who was elected on an YSR Congress ticket, switched over to TDP. He was elected to Lok Sabha in 2009 on a Congress ticket. Reddy's switch-over has come as a surprise as he was part of an MP's delegation of YSR Congress led by party chief Y S Jaganmohan Reddy which met Prime Minister-designate Narendra Modi and BJP President Rajnath Singh.