WASHINGTON – Secretary of Defense Jim Mattis told Saudi Crown Prince Mohammed bin Salman on Thursday there was an urgent need to find a political solution to Yemen’s war, as he voiced hope for a U.N. special envoy’s peace efforts and firmly backed Riyadh.

A Saudi-led coalition intervened in neighboring Yemen in 2015 against Houthis Yemeni group, who had ousted the government of President Abd-Rabbu Mansour Hadi. The civil war has killed an estimated 10,000 people.

People carry water tanks as they walk at the site of damage after a Saudi-led air strike, north of Yemen’s capital Sanaa, March 8, 2018. REUTERS/File Photo

“We must also reinvigorate urgent efforts to seek a peaceful resolution to the civil war in Yemen and we support you in this regard,” Mattis said.

Asked by reporters at the start of his talks whether he would raise the issue of civilian casualties in Yemen, Mattis said: “We are going to end this war, that is the bottom line. And we are going to end it on positive terms for the people of Yemen but also security for the nations in the peninsula.”

Earlier this year, the United Nations chief appointed former British diplomat Martin Griffiths as his new envoy charged with trying to broker peace in Yemen.

The war in Yemen has displaced more than 2 million people and driven the country – already the poorest on the Arabian Peninsula – to the verge of widespread famine. Nearly 1 million people have been infected with cholera.

On Tuesday, the U.S. Senate killed a resolution seeking an end to U.S. support for Saudi Arabia’s campaign in Yemen.

The Senate voted 55-44 to dismiss the resolution, which sought for the first time to take advantage of a provision in the 1973 War Powers Act that allows any senator to introduce a resolution on whether to withdraw U.S. armed forces from a conflict not authorized by Congress.

The vote was largely along party lines, although a handful of Democrats voted with the majority Republicans to kill the measure, and a handful of Republicans supported the failed effort to let it move ahead.

During Senate debate before the vote, some backers called the three-year-long conflict in Yemen a “humanitarian catastrophe,” which they blamed on the Saudis.

The United States provides refueling and intelligence support to the Saudi-led coalition.