Colorado’s U.S. senators split Wednesday over whether to end America’s involvement in Yemen’s civil war.

Sen. Michael Bennet, a Denver Democrat considering running for president in 2020, voted in favor of a resolution ending assistance to Saudi Arabia in Yemen. Sen. Cory Gardner, a Yuma Republican, voted against the resolution, which passed the Senate 54-46.

Yemen’s civil war, which has raged for nearly four years and killed thousands of civilians, is being fought between a coalition of government fighters and Houthi rebels. Saudi Arabia has backed the coalition, and the United States has provided intelligence and logistical support.

That support was criticized last year as civilian deaths added up and Saudi Crown Prince Mohammed bin Salman faced accusations of ordering the execution of journalist Jamal Khashoggi, an American resident.

The U.S. should never take an action that allows Iran to continue destabilizing the Middle East. The resolution before the Senate this evening empowers Iran, something I cannot support. — Cory Gardner (@SenCoryGardner) March 14, 2019

Wednesday marks the second time in three months the Republican-controlled Senate has voted to block American involvement on the Arabian Peninsula. It did so in December, with Bennet voting in favor and Gardner against, but the resolution was not considered by what was then a Republican-controlled House.

After Democrats took control this year, the House passed a similar measure in February, with only one Colorado member, Republican Rep. Doug Lamborn of Colorado Springs, opposed to the resolution. Two other Colorado Republicans, Reps. Scott Tipton of Cortez and Ken Buck of Windsor, joined all four Colorado Democrats in support of that resolution.

Because the Senate resolution that passed Wednesday is slightly different than the House measure that passed in February, the Senate version must now be voted on in the House, where passage again appears likely.

The White House has indicated President Donald Trump will veto the resolution when it reaches his desk. It would be his first veto as president.