In striking Syria without an international law justification, the United States leaves itself open to criticism and may invite similar behavior by other countries.
This article originally appeared on the Council on Foreign Relations.
In the wake of recent air strikes on Syria by the United States and its allies, some lawmakers in Washington and other world capitals are questioning the attacks’ legal basis. The Trump administration claims the recent assault was justified, but it has not laid out a rationale based on international law, says CFR’s John Bellinger, legal advisor at the National Security Council and the State Department during the George W. Bush administration. This leaves the United States open to charges of acting lawlessly and inviting similar behavior by other countries, he says. The United Kingdom is the only government that has explicitly said its use of force comports with international law, citing humanitarian grounds.
When the United States conducts a military strike such as this one, the White House looks to demonstrate that the use of force is permissible under both domestic and international law. How is the Trump administration framing these strikes from a legal standpoint?
President Trump himself has not addressed the legal basis for either the strikes on Syria last year, on April 6, or those this past Friday, April 13, in any of his oral statements.
The president’s letters to Congress submitted pursuant to the War Powers Resolution within forty-eight hours after each of the two strikes, state that he acted in the “vital national security and foreign policy interests of the United States” and “pursuant to my constitutional authority to conduct foreign relations and as Commander in Chief and Chief Executive.” He did not cite any congressional authorization for the use of force. In both letters, the president stated that he had ordered the actions “to degrade the Syrian military’s ability to conduct further chemical weapons attacks and to dissuade the Syrian regime from using or proliferating chemical weapons” and to avert “a worsening of the region’s current humanitarian catastrophe.”
Trump administration officials have not cited any international law basis for the April 2017 or April 2018 strikes, and it would be difficult for them to do so. The UN Charter specifically prohibits a UN member state from using force against another member state except in self-defense or if authorized by the Security Council.
In a statement to the Security Council on Saturday, U. S. Ambassador to the UN Nikki Haley defended the recent strike as “justified, legitimate, and proportionate,” which is carefully chosen, quasi-legal language suggesting that Trump administration lawyers concluded that the use of force could not be characterized as lawful under international law but was still appropriate on the basis of the specific facts in Syria. The Clinton administration adopted the same approach when it cited a number of factors as justifying U. S. air strikes against Serbia in Kosovo, without claiming that the use of force was legal.
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United States Ambassador to the United Nations Nikki Haley and Karen Pierce, UK Ambassador to the United Nations vote against a Russian resolution condemning ‘aggression’ against Syria by the U. S. and its allies during an emergency United Nations Security Council meeting on Syria at the U. N. headquarters in New York, U. S., April 14,2018. REUTERS/Eduardo Munoz REUTERS/Eduardo Munoz
Why does the legal rationale matter?
It is important for Trump administration officials and lawyers to explain the legal basis or justification for any U. S. use of military force, including in Syria. As I said in testimony [PDF] before the Senate Foreign Relations Committee last December regarding legal rules governing the use of force: “When the United States does not [explain the legal basis for its actions], it appears to act lawlessly and invites other countries to act without a legal basis or justification.”
There looks to have been considerable debate within the administration over launching these strikes, ultimately deciding to go with a more restrained response. What do you make of the proportionality question?
The April 13 strike was obviously quite limited. It’s not clear whether this was for a policy reason, i.e., to avoid provoking the Russians or Iranians, or for a legal reason, i.e., to allow the United States to claim that its use of force, even if not consistent with the UN Charter, at least met the customary international law requirement that any use of force be proportional to the threat.
To what extent does the Trump administration’s legal rationale diverge from that for last year’s attack?
The administration has relied on the same domestic law basis for both strikes, i.e., the president’s inherent constitutional powers, rather than any congressional authorization.
Although the administration has not (and probably could not) offer a clear international law basis for either strike, Ambassador Haley’s statement that the most recent strike was “justified, legitimate, and proportionate” appears to be an effort, perhaps urged by administration lawyers, to provide an international law justification.
How are the United Kingdom and France handling the legal questions?
The United Kingdom appears to be the only one of the three governments who participated in last week’s strikes to state explicitly that its use of force was lawful under international law. The French government does not appear to have specifically addressed the legality of its use of force.
On Saturday, the British government released an explanation of its legal position, stating that the international legal basis for the use of force was “humanitarian intervention.” The British statement said that Syria’s use of chemical weapons against its civilian population constituted a war crime and crime against humanity; that “there was no practicable alternative to the truly exceptional use of force to degrade the Syrian regime’s chemical weapons capability and deter their further use by the Syrian regime in order to alleviate humanitarian suffering”; and that the use of force was “necessary and proportionate and therefore legally justifiable.”
Under UK law, the British government may not use military force unless it has concluded that the use of force is lawful, including under international law. To participate in the strikes, the British government was therefore required to conclude specifically that its use of military force was permitted under international law, not simply justifiable. The United Kingdom is one of the few countries in the world to recognize a legal right of humanitarian intervention. The British relied on this doctrine as the basis for their participation in the 1998–1999 Kosovo bombing campaign, and the [David] Cameron government said in 2013, at the time that Britain was considering intervention in Syria, that international law recognizes a right of humanitarian intervention.

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