The Senate is expected Tuesday to vote on a resolution seeking to block part of President Trump‘s proposed $110 billion arms deal with Saudi Arabia. Critics of the arms package say it could further entangle the U.S. in a disastrous civil war in Yemen, where Saudi forces have been accused of war crimes.

The resolution only seeks to block a portion of the overall arms deal, which was struck in May between Trump and Salman Bin Abdulaziz Al Saud during Trump’s first trip abroad as president. The proposed arms deal includes a range of defense services and equipment, including patrol boats, Patriot missiles, and THAAD missile defense systems.

Co-sponsored by Kentucky Republican Sen. Rand Paul and Democratic Sens. Chris Murphy of Connecticut and Al Franken of Minnesota, the resolution of disapproval specifically targets a proposed $510 million sale of precision-guided munitions, which have reportedly been used by Saudi forces against civilian targets in Yemen. The measure to block the sale was buoyed Monday when Senate Minority Leader Chuck Schumer also signaled his support, and again on Tuesday when Republican Indiana Sen. Todd Young also backed the measure.