Nick Schifrin:

Since early 2015, a Saudi-led coalition has been fighting Iranian-aligned Houthi rebels in Yemen.

Yesterday, the Houthis and the U.N. blamed the coalition for an attack in Yemen's west that reportedly killed 30 people, including women and many children.

The coalition disputes that claim.

Earlier this month, the U.N. says a coalition airstrike hit a school bus, killing at least 51 people, including 40 children.

The U.S. provides support to the coalition. And now some in Congress are calling for the Pentagon and White House to better describe that support. Some on Capitol Hill want the U.S. to cease its involvement altogether.

For more on this, we're joined from Beirut by Kristine Beckerle, the Yemen researcher at Human Rights Watch, and the author of a report released today, "Hiding Behind the Coalition – Failure to Credibly Investigate and Provide Redress for Unlawful Attacks in Yemen."

Kristine Beckerle, thank you very much for joining us.

The U.S. says it only provides midair refueling and does not provide any targeting. Is that what you understand?