More than 4,000 civilians have been killed since March 2015, according to the United Nations.

In September, a bipartisan group of senators mounted an unsuccessful attempt to block a $1.15 billion arms sale over the issue.

Further, the U.S. is also changing training to improve the Saudi air force’s targeting, according to reports citing anonymous officials.

Other aspects of U.S. support, including air refueling, will remain the same, the reports say.

Rep. Ted Lieu (D-Calif.), one of Congress’s most outspoken critics of the administration’s support of the Saudi-led campaign, called the continuation of air refueling “shameful.”

“SHAMEFUL that US continues to refuel #Saudi jets that drop bombs on women & children in #Yemen,” Lieu said in a tweet Tuesday.

[link to thehill.com]