The bill, called the No WAR Act, aims to restrict the use of reconciliation measures to provide budget authority for any unauthorized military force against Iran. It seeks to enact limitations preventing the consideration of any reconciliation bill or resolution that appropriates funds for hostilities against Iran, including those carried out by proxy forces, unless Congress has authorized such actions. The bill defines "hostilities" to include offensive military operations, strikes, covert actions, or sustained engagement against Iranian military forces or government institutions. It also defines "proxy forces" as foreign military groups operating at the direction or with the support of the United States.