competition: You're The President of the United States

Immediately following the attack, the CIA informs you that a large terrorist organization in Pakistan claims responsibility for the attack. What is your course of action following the tragedy and the new intelligence? Will you invade Pakistan or will you slap them with sanctions? Will you wait for UN approval or immediately invade? Keep in mind you are now much older and the Iraq/Afghanistan war is long over and we have a large & well-rested military once again.