In August, the world watched in horror as a Saudi-led coalition airstrike in Yemen claimed the lives of 40 innocent children. The boys, many under the age of 10, were killed when their school bus was bombed during a class trip. The weapon used in that deadly bombing was made in America.

It was not the first time. In June, airstrikes hit a cholera treatment center run by Doctors Without Borders, even though it was clearly identified as a medical facility.

In April, 20 civilians, many from a single family, were killed while celebrating a wedding in a village in northwest Yemen.

As a result of this conflict, at least 10,000 Yemenis have died, 2 million more are displaced, and 22 million are in need of humanitarian assistance . To make matters worse, a man-made famine has brought nearly 8 million people in Yemen to the brink of starvation

This humanitarian catastrophe didn't happen overnight. For more than three years, a military coalition led by Saudi Arabia and the United Arab Emirates has been bombing Yemen as part of a proxy war to counter the Iran-supported Houthi militias.

During this period, the United States has been quietly providing intelligence and military advice to the Saudi-led coalition. Our government refuels Saudi coalition warplanes in midair. Our government provides advice and assistance. Our government authorizes the sale of US-made bombs and missiles the coalition uses to conduct this war.

There is no doubt that Iran's actions in Yemen are destabilizing. Iran's government supports militias that attack Saudi territory and undermine the internationally recognized central government of Yemen. But we can no longer turn a blind eye to the actions of the Saudi coalition -- or our own role in the suffering of the Yemeni people.