(CNN) US Sens. Jeanne Shaheen and Todd Young have sent a letter to Secretary of State Mike Pompeo ahead of a Saturday deadline for him to re-certify to Congress that Saudi Arabia and the United Arab Emirates are taking adequate measures to avoid harming civilians in Yemen.

The bipartisan letter calls for "a certification that better reflects the facts on the ground" in Yemen.

"We remain concerned that the previous Yemen certification submitted to Congress did not accurately reflect known facts on the ground. As such, any follow-on certification should take all evidence into account and succinctly demonstrate to the Saudi-led coalition that the American people and their representatives in Congress will not stand for the continued disregard of the security and humanitarian interests of the US," the two senators wrote.

"We believe it is vital that our security partners be reminded of their commitments to US interests, laws and humanitarian principles."