For three years, the United States has supported a coalition led by Saudi Arabia that is waging war inside Yemen. Our role in the coalition is significant -- we sell bombs and weapons to the Saudis, we help them pick targets inside Yemen, and until recently, we refueled their planes in the sky. To anyone paying attention, it's clear that the United States is engaged in a war in Yemen. And yet this war has not been authorized or debated by Congress. Our involvement started quietly under President Barack Obama, and now President Donald Trump has increased our participation. Yemen has become a hell on earth for the civilians caught within its borders. More than 10,000 innocents have been killed in the Saudi-led bombing campaign since the beginning of the civil war. Targets have included schools, hospitals, weddings, a funeral party and recently a school bus carrying 38 children to a field trip. More than 22 million people - three quarters of the population - require humanitarian assistance and protection. The country is on the brink of famine and is in the midst of the worst cholera outbreak in the world. To date, an estimated 85,000 children under the age of 5 in Yemen may have died from starvation and disease. In many ways, this suffering is an intentional byproduct of the Saudi coalition, which has targeted water treatment plants, health clinics and even a Doctors Without Borders hospital, all with US assistance.