How is invading Afghanistan against the constitution? >even though neither country attacked the U.S Afghanistan attacked the US by allowing an terrorist group

How is invading Afghanistan against the constitution? >even though neither country attacked the U.S Afghanistan attacked the US by allowing an terrorist group who declared war on America plot an attack on the United States from their country. >and therefore attacking both of them was a U.N. Charter violation, which we are of course signatories to. The UN Charter allows for self defense AND the UN authorized the attacks. In fact the ISAF is a UN operation.