Is a successful terrorist attack grounds for....

Since 9/11 it would seem to most logical people that the primary job of the government of the United States and the Commander and Chief of the United States (that’s you Barack), would be the protection of the people of this country from another attack. So my question to the members of RedState is this, would a successful terrorist attack rise to the level of "high crimes and misdemeanors"? In other words if a President from any party allows an attack on this country after 9/11does it rise to the level of an impeachable offense?

Just a thought provoking exercise that I’m sure there would be a lot of opinion on.