On the tactics used by US forces in the killing of bin Laden, which the Left found abhorrent under President Bush, but which it now accepts.
So again, to review: an American President, with admittedly incomplete intelligence, invades a foreign and supposedly friendly nation. Without that nation's knowledge or consent. Using information extracted from Guantanamo detainees subjected to allegedly illegal enhanced interrogation methods, i.e. waterboarding... and all of this was done without any United Nations resolution or authorization of any kind.