16

The USA has many times in the past taken military action with only the President's order to back it up legally. It was Jefferson that set the precedent of using the military to enforce foreign policy when he ordered the assault on the Barbary Pirates, though there was some measure of congressional approval (I've often wondered why this discussion was not had after the Whiskey Rebellion, but that was different in a few ways). Fast forward to the past two decades and there are numerous examples of the president ordering military assaults on sovereign nations unilaterally, meaning, without any discussion or approval from Congress. The most recent example is that of current President Trump ordering a missile strike on Syrian forces believed responsible for a chemical attack on Syrian citizens.

From my reading, it seems to me that at least some congressional approval is required for any military action, per the Constitution. Many pundits certainly agree. However, many still implicitly support unilateral presidential military orders by not objecting to President Trump's order, and even applauding it. Further, some argue that the Constitution mandates a formal declaration of war if there is to be any military action.

What is the line here? At what point must the president seek congressional approval to order military action? Is it based on targets, scale of the attack, or something else? At what point is a formal declaration of war necessary? Is scale a factor, considering Vietnam and Korea? I have to be honest, it seems like a damn free-for-all with zero checks and balances, and it's just a matter of time until the president unilaterally plunges the world into nuclear war.

7

The War Powers Resolution of 1973 sets forth the official 'rules' for what the President can do, and how Congress needs to be involved.

The War Powers Resolution requires the President to notify Congress within 48 hours of committing armed forces to military action and forbids armed forces from remaining for more than 60 days, with a further 30-day withdrawal period, without a Congressional authorization for use of military force (AUMF) or a declaration of war by the United States.

In practice, Congress has been pretty elastic in enforcing the letter of the resolution...

Yes, the President can theoretically initiate a nuclear strike on his own (not clear if this is actually true in the absence of any threat to the US) but he would still need to notify congress within 48 hours.

Edit: https://politics.stackexchange.com/a/9845/11434 gives a more detailed answer on the President's ability to launch nukes on his own.

Update: April 7, 2017 Nukes Podcast from Radiolab discusses the President's authority to launch a nuclear strike. In short, the 'nuclear football' that is near him 24/7 has (among other things) a menu of options including targeting lists and authentication codes, and connects him directly to the National Military Command Center (NMCC). He may consult with others, but he is under no obligation to take their advice. Implicitly, the land based ICBM's would be on their way within 10 minutes of him picking up the phone.

  • So the president may take any military action of any magnitude against any target so long as he informs congress within 48 hours and does not take longer than 60 days? – fredsbend Apr 9 '17 at 1:18
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    Caveat: WPR was never tested in Supreme Court. So it's unknown if it would stand Constitutional scrutiny. – user4012 Apr 9 '17 at 1:45
  • @fredsbend Apparently so. I just read that Pres. Trump has sent a letter to Congress relating to the Syria attack, so he may be trying to follow the WPA requirements... Up to Congress whether that's sufficient. – BobT Apr 9 '17 at 1:52
  • Just read this Vox article. Trump could make the same argument Obama did regarding Syria, that an AUMF is not needed in this case. Very interesting. Hard to believe that in 240 years, the courts or Congress have never nailed down the limits of the President's powers in this regard. – fredsbend Apr 9 '17 at 2:49
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    @fredsbend - that doesn't include the "30 day withdrawal" period, where, presumably, strikes can be launched even as numbers of troops are drawn down. And, yes, as long as the meaninglessly broad post-9/11 "anti-terror" (ironically named, since it was a creation driven by utter fear) AUMF remains in place, there are really no limitations. Obama had even asked that it be rescinded and a more narrowly defined AUMF be issued for actions he was taking, but Congress, of course, did nothing, instead. – PoloHoleSet Apr 10 '17 at 17:03
1

Previous answer has explained how the war powers resolution brings in congress. To add to that The war powers resolution, in answering the original question, wiki says that the president may act under

  1. A declaration of war( by congress ( the traditional path ) )
  2. A specific statutory authorization( this one is kind of confusing but here is an example
  3. A national emergency created by an attack on the United States, its territories or possessions, or its armed forces.

These are what initiate the President's ability to move independently of congress.

Where it gets foggy these days is what is determined to be an "armed conflict". Drones are a great example of a situation that falls through the cracks of the current set of rules.

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    As with most things in politics, these are the rules, abiding by them is a completely different discussion – discodane Apr 14 '17 at 19:09
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    And enforcing them yet a third discussion. – fredsbend Apr 14 '17 at 20:35

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