The BJP on Friday criticised the opposition Congress, BSP, SP and AAP parties for opposing the Narendra Modi government's decision to demonetize Rs 500 and Rs 1,000 notes, saying that they have "exposed themselves" by doing so.Addressing a press conference here, BJP chief Amit Shah said he does not understand why parties like the Congress, Bahujan Samaj Party, Samajwadi Party and the Aam Aadmi Party, which were demanding action against black money, are criticising the demonetization decision now."I can understand the trouble and pain of tax evaders, terrorists, Maoists and others involved in black marketing, but I can't understand problems of these political parties...Why are they opposing the government's move to demonetize currency notes of Rs 500 and Rs 1,000," he said.He proceeded to add that "these political parties have actually exposed themselves" by going against the government move."I want to ask them whether they are against black money or not. Congress, AAP, SP and the BSP should clarify this to the nation," he said.Talking about the decision, the BJP chief said it was a planned decision and would throw out black money and counterfeit currency from the system.