WASHINGTON — Imagine that the entire population of Washington State — 7.3 million people — were on the brink of starvation, with the port city of Seattle under a naval and aerial blockade, leaving it unable to receive and distribute countless tons of food and aid that sit waiting offshore. This nightmare scenario is akin to the obscene reality occurring in the Middle East’s poorest country, Yemen, at the hands of the region’s richest, Saudi Arabia, with unyielding United States military support that Congress has not authorized and that therefore violates the Constitution.

For nearly three years, the United States has been participating alongside a military coalition led by Saudi Arabia and the United Arab Emirates in a brutal military campaign in Yemen. The United States is selling the Saudi monarchy missiles and warplanes, assisting in the coalition’s targeting selection for aerial bombings and actively providing midair refueling for Saudi and United Arab Emirates jets that conduct indiscriminate airstrikes — the leading cause of civilian casualties. Meanwhile, the Saudi coalition is starving millions of Yemenis as a grotesque tactic of war.

This is horrifying. We have therefore introduced a bipartisan congressional resolution to withdraw American armed forces from these unauthorized hostilities in order to help put an end to the suffering of a country approaching “a famine of biblical proportions,” in the words of Jan Egeland, the head of the Norwegian Refugee Council. After all, as Foreign Policy has reported, the Saudi coalition’s “daily bombing campaign would not be possible without the constant presence of U.S. Air Force tanker planes refueling coalition jets.”

How did we get to this point?

In March 2015, the United States introduced its armed forces into the Saudi regime’s war against an uprising of Yemen’s Houthis, a rebel group that rapidly took control of Yemen’s capital, Sana, and eventually most of the country’s cities, by allying with forces loyal to an ousted former president, Ali Abdullah Saleh. But the Shiite Houthi rebels are in no way connected to the Sunni extremists of Al Qaeda or the Islamic State, which the United States has been going after across the globe under the Authorization for Use of Military Force of 2001. American participation in the war in Yemen is not covered by that authorization.