The president has no constitutional authority to start a war. This was by design. The founders understood that putting war powers in the hands of the executive was dangerous.
For More Information
Reference Guide: The Constitution and War Powers
The Constitution and War Powers: Not a Presidential Dictatorship
Using Force in Ukraine Requires Congressional Approval
Biden Ramping Up Unconstitutional War in Somalia Again
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- Who’s in Charge? The Founders on Sovereignty - February 4, 2026