a police don’t need a warrent to enter a house if he see someone breaking into a house. Its the same principle. The police can’t just lie and say he saw someone breaking into the house. In that case he is abusing his power thus illegal. Bush can’t just wiretap anyone he wants without cause related to Al Qaeda terrorism. An abused would be like Britian PM who used his country terrorism law by locking out an ireland bank on issues not related to terrorism
To my knowledge there has never been an instance where this was improperly applied. It's just another case of lying Democrats.