"We are skeptical a certification that the two Governments have undertaken demonstrable actions to reduce the harm to civilians is warranted when the Saudi coalition has failed to adopt some US recommendations while civilian deaths and casualties due to coalition airstrikes have increased dramatically in recent months," the letter said on Wednesday. The lawmakers called on Pompeo to hand over data on the increase in civilian casualties, among other requests, by October 31.
The letter was signed by Senators Chris Murphy, Todd Young, Jeanne Shaheen, Susan Collins, Chris Coons, Jerry Moran and Jeff Merkley.
Yemen has been gripped by a civil war with the government headed by Abd Rabbuh Mansur Hadi fighting the Houthi movement. The government is backed by the Saudi-led coalition, which has been carrying out airstrikes targeted at the areas controlled by the Houthis since March 2015.