Could a President Trump go to war at his sole discretion?
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Beginning with President Truman's decision to go to war against North Korea without congressional approval, U.S. presidents of both parties have unilaterally ordered the use of military force. As George Washington correctly recognized, the Constitution "vests the power of declaring war with Congress; therefore no offensive expedition of importance can be authorized until they [Congress] have deliberated upon the subject, and authorized such a measure." Washington had it right — the drafters of the Constitution only intended for presidents to act unilaterally in an emergency, when there was no time to consult Congress.

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Unfortunately, because presidents since Truman have disregarded the constitutional framework, and Congress has failed to assert its institutional powers and responsibilities, a dangerous precedent seems to have developed. It is a precedent based on practice alone — in other words, the actions (and inactions) of the executive and legislative branches. These actions cannot change the plain text and meaning of the Constitution. However, the Constitution is not self-enforcing. As things currently stand, presidents are able to exceed constitutional limits because Congress fails to act. For instance, President Obama has made the unilateral decision to go to war with the Islamic State in Iraq and Syria (ISIS) while Congress has simply declined to weigh in on the matter.

ISIS is such a hideous group that this particular action may not bother us, and may not bother members of Congress. Most Americans, and most legislators, may not see the need for insisting that Congress play a role in deciding whether it makes sense to act against ISIS. The precedent, however, should be reason for concern. Even if we think it makes sense to go to war with ISIS, and even if we trust President Obama (or a President Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers MORE or Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support MORE) to make this decision alone, it's worth thinking through what this could mean.

After Super Tuesday, Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE is riding a powerful political wave. He seems poised to win the Republican nomination for president. Let's imagine he does, in fact, win that nomination. Let's further imagine that he wins the general election and becomes president. A President Trump would be poised to rely on the precedent, based on past practice, that presidents can unilaterally decide when to order the use of military force. The Obama administration has suggested that there may be some limits to that precedent — that presidents may only order the use of military force when it is in the national interest to do so, and when such actions do not rise to the level of war (under the Constitution) or hostilities (under the War Powers Resolution). But even assuming that Trump decided to recognize such principles, those apparent limits leave a great deal of room for presidents to act. Devastating military force can be deployed without (in the Obama administration's view) rising to the level of war or hostilities. "National interest" is a highly subjective standard. The Obama Department of Justice noted that it could include "preserving regional stability." Trump might decide regional stability is threatened by a flow (whether real or imagined) of immigrants from Mexico. He might conclude it is essential to regional stability that he achieve his chimerical goal of making Mexico pay for a border wall, and he might determine military force is necessary to force Mexico's hand. This reasoning may well seem ludicrous and unsustainable. But, unless Congress were to demonstrate a rare ability to play its constitutional role when it comes to war power, Trump would be free to act.

Trump could also conclude that his unilateral power extends beyond decisions to use military force. Executive branch lawyers in the George W. Bush administration concluded that the president, as commander in chief, has inherent authority to make decisions about which interrogation methods to use with prisoners. This inherent authority, lawyers concluded, cannot be restrained even by criminal law. In other words, the president can order interrogation methods (like waterboarding) that violate U.S. criminal law against torture. The Obama administration has not endorsed this radical legal theory, but it also declined to punish anyone for authorizing torture. Trump might reasonably conclude that he and his administration could authorize waterboarding, or other methods of torture, with impunity.

Our Constitution was built on the premise that no person, not even the president, can set aside the law and no one person, not even the president, can take the country to war. The dangerous implications of recent precedent, especially since 9/11, that rejects these constitutional standards should be crystal clear to us when we contemplate the possibility of a Trump presidency.

Edelson is an assistant professor of government in American University’s School of Public Affairs. His book, "Power Without Constraint: The Post 9/11 Presidency and National Security," will be published in spring 2016 by the University of Wisconsin Press.