It isn't the prerogative of the CIC. The war powers act gives the CIC limited deployment options for emergency situations but he still has to go to Congress. The Constitution gives 3 ways military force can be used, all part of Article 1, Section 8 (Congressional authority). Declaration of war, quelling insurections and rebellions, and stopping piracy or offenses against the laws of nations. Our system does not give absolute power to the President.
We should not let Obama's misdeeds go ignored just because we don't like that it is McCain who is calling this error out.
Correct.
Rand Paul and others have remarked on our support of Saudi Arabia in Yemen may well be using war powers. While generally, we are not directly in Yemen fighting, we may give Saudi Arabia some assistance with locations to bomb or things like that and that is besides providing them weaponry that they are using. Same for Canada and UK, they are providing weapons the Saudis are using. Some in congress ask if this crosses the line.
We also raided that Al Qaeda locale in Yemen. What we are doing in Niger, seems to be fighting terrorists. If we send advisors, I'm probably generally okay with that.
And look at Syria, there has never been any official act by congress that I know of to go in there, but we are mainly bombing ISIS and helping the forces we back which is okay with a lot of people.
Maybe it comes under some sort of umbrella "war on terror", WOT.