Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Trump, Congress Spar Over Iran War Powers Katherine Gypson CAPITOL HILL - The U.S. House of Representatives will vote this week on legislation aimed at preventing the engagement of U.S. forces with Iran unless Congress gives its approval. The vote comes after U.S. President Donald Trump ordered an airstrike last week that killed Iranian General Qassem Soleimani, escalating regional tensions and leading many congressional Democrats to express concerns the move could lead to open war between the U.S. and Iran. How does the US declare war? According to Article I of the U.S. Constitution, Congress has the authority to declare war, while Article II gives the president the responsibility of being the commander-in-chief of the armed forces. The framers of the Constitution deliberately split these powers among branches of the U.S. government to prevent an unconsidered, unilateral move toward war. Throughout American history, the legislative and executive branches have clashed over the interpretation of these powers as laid out in the Constitution. These questions increased as American conflicts abroad -- including U.S. involvements in Korea and Vietnam -- became increasingly difficult to define and occurred without an official declaration of war. The last time Congress passed an official declaration of war was almost 80 years ago, during World War II. .