How Can a President Go to War Without Congress?
A viewer from England recently asked a reasonable question about the war with Iran:
Doesn’t Congress have the power to declare war?
And doesn’t Congress control the money?
Yes.
So how can President Trump order military operations against Iran without first receiving congressional authorization?
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The American system divides war powers between two branches, and then leaves them to argue about where one branch’s authority ends and the other begins.
Congress decides whether the United States should authorize and sustain a war. The president commands the military. In theory, this creates a balance. In practice, the president can act quickly while Congress must organize hundreds of people before it can respond.
Article I of the Constitution gives Congress the power to declare war, raise and support armies, maintain a navy, regulate the armed forces and appropriate money.
Article II makes the president Commander in Chief.
That means Congress does not select targets, position aircraft carriers or write air-tasking orders. Once military force is authorized, those decisions belong to the president and the chain of command.
The president also has broad authority to respond when the United States or American forces are attacked. Nobody expects Congress to hold three days of hearings while missiles are already inbound.
The dispute begins when a president moves beyond immediate defense.
Successive Republican and Democratic administrations have argued that the president may order limited military action without congressional authorization when the operation serves an important national interest.
Congress has generally claimed a narrower interpretation.
The War Powers Resolution
After Vietnam, Congress passed the War Powers Resolution of 1973 over President Richard Nixon’s veto.
The law says the president should consult Congress before introducing American forces into hostilities whenever possible. Once forces are introduced, the president must report to Congress within 48 hours.
The president then generally has 60 days to end the operation unless Congress declares war, authorizes the mission or extends the deadline. An additional 30 days may be allowed to withdraw forces safely.
Presidents have long argued that portions of the law unconstitutionally restrict their authority as Commander in Chief. When administrations report military action to Congress, they often say they are acting “consistent with” the War Powers Resolution rather than “pursuant to” it.
That wording is deliberate.
It essentially means: I am giving you the report, but I am not admitting that you have the constitutional authority to make me do it.
In the case of Iran, the Trump administration argued that the president had authority under Article II to protect the United States, American citizens, military forces and vital national interests.
Opponents argued that destroying another country’s navy, missile infrastructure and military facilities during a sustained campaign is exactly the kind of war the Constitution requires Congress to authorize.
Then comes the 60-day clock.
The administration argued that the original hostilities had ended with a ceasefire and that later military actions were not a continuation of the same campaign.
Members of Congress disagreed.
This highlights one of the central weaknesses of the War Powers Resolution: the executive branch controls the military and frequently controls the definitions.
Is it a war? Is it a limited operation? Are American forces involved in hostilities? Has the operation ended if aircraft are still striking targets, but the original campaign name has been retired?
The answer often depends on which branch is writing the legal memorandum.
Why Doesn’t Congress Stop the President?
Congress can attempt to stop a military operation. The problem is that Congress is not one person. It is 435 representatives, 100 senators, two chambers, dozens of committees and two political parties filled with people who have conflicting ambitions.
The House may vote to oppose an operation while the Senate refuses to advance the same measure. Even if both chambers pass binding legislation, the president can veto it. Congress would then need two-thirds of both chambers to override that veto.
The practical question is therefore not whether Congress has war powers. It totaly does.
The question is whether opponents can assemble majorities in both chambers—and perhaps two-thirds majorities—to force the president to stop.
That is much harder. There is also a political problem.
Members of the opposition party may believe the war is a mistake. But if the conflict causes fuel prices to rise, damages the economy and hurts the president’s political standing before the midterm elections, they may not be especially eager to rescue him from his own decisions.
Never interrupt your enemy when he is making a mistake.
What About the Money?
Congress controls federal appropriations, but the Defense Department receives enormous pools of money before a crisis begins.
The Pentagon does not need to ask Congress for the price of every bomb before dropping it. It can initially fund unexpected operations through existing operations-and-maintenance accounts and legally permitted transfers.
Congress gains more leverage when the administration needs supplemental funding to replenish weapons, sustain deployments and replace equipment. Congress can prohibit money from being used for a specific military operation. But that prohibition must pass both chambers and either receive the president’s signature or survive a veto.
There is also a political trap. Lawmakers who oppose starting a war often become nervous about being accused of withholding ammunition, air defense or protection from troops once the war has begun.
So the power of the purse is extremely powerful in theory and remarkably difficult to use in practice.
Presidential Initiative and Congressional Restraint
A president can act with a single order.
Congress must organize hundreds of lawmakers, pass identical legislation through two chambers, overcome procedural obstacles and possibly override a presidential veto.
Meanwhile, the military has already been funded. The courts usually avoid intervening. The executive branch interprets its own authority broadly. And enough members of Congress either support the operation or do not want responsibility for ending it.
The Constitution gave Congress the tools to restrain a president.
It did not make those tools automatic. The president possesses initiative. Congress possesses checks and balances.
But a check only works when Congress is willing and able to use it.
