Hitting out at Union Home Minister Amit Shah's 'Didi-Bhaipo' jibes, West Bengal Chief Minister Mamata Banerjee on Thursday challenged him to contest an election against her nephew Abhishek Banerjee and then think of fighting her. Addressing a party rally in Pailan in the South 24 Parganas district, Banerjee said that Abhishek could have taken the easy route of being an MP by choosing to be a Rajya Sabha member but he fought the Lok Sabha election and got the people's mandate. "Day and night they are talking about Didi-Bhatija. I challenge Amit Shah, contest against Abhishek Banerjee first and then me," she said, amid a loud cheer from supporters.