The entire nation should speak in one voice and no party should indulge in politics over the terror attack in Punjab, union minister Venkaiah Naidu said here on Monday."On the issues of terrorism, the entire nation should speak in one voice," Naidu said.Slamming the Congress, the urban development minister said, "It is unfortunate that a party like the Congress has started blistering those statements over the Punjab terror attack."This is sending a wrong signal. This sort of activity is not going to help them retract lost (political) ground."He said once the encounter between the holed-up terrorists and security forces in Dinanagar town of Gurdaspur district in Punjab was over, the government would make a statement in parliament.