Why Doesn't President Obama make America Invade Pakistan? That is where the Al Qaida group are hiding?

We are actually FAILING in Afghanistan. The whole country is corrupt...and the Taliban isn't even in Afghanistan they are in Pakistan. Once our American forces leave, the Taliban will come back to destroy the country our American troops liberated. So why doesn't Obama make the Army invade Pakistan and take all the taliban people out...cuz only america has the global reach to defeat the terrorists.