The U.S. Senate voted on Thursday to block the Trump administration's effort to complete an arms sale worth billions of dollars to Saudi Arabia.

The move is a clear sign of lawmakers' discontent with the Trump administration's decision in May to bypass the review process of Congress to complete arms sales to three Gulf countries: Saudi Arabia, Jordan and the United Arab Emirates.

Secretary of State Mike Pompeo announced last month that the Trump administration would invoke an emergency provision of the Arms Export Control Act to complete the multi-billion dollar arms sale to the three Arab countries to deter threats from Iran.

The military equipment includes aircraft support maintenance, intelligence, surveillance, and reconnaissance, ammunition and other supplies, according to the US State Department.

Republicans and Democrats are unhappy about the government’s employment of emergency power to sideline lawmakers out of national security decisions. Additionally, members are outraged by the continued support of Saudi Arabia by the White House despite pressure to have action taken against Crown Prince Mohammed bin Salman over the killing of journalist Jamaal Khashoggi in October 2018.

This marks the second time in recent months that the Republicans have differed in public with President Donald Trump’s foreign policy. In April, both the House of Representatives and the Senate voted to end American military involvement in Saudi Arabia’s civil war in Yemen. President Trump vetoed the decision.

The House of Representatives, which is controlled by the Democrats, is expected to also block the effort but Trump is likely to veto the measure.