A Navy warship has seized a "significant cache" of suspected Iranian guided missile parts headed to rebels in Yemen.
The ScanEagle is a reconnaissance drone launched by catapult that costs over $3 million.
The U.S. is awaiting a final assessment from the Saudis on "where they believe the attacks came from."
Al-Malki made a point not to directly accuse Iran of firing the weapons or launching them from inside of Iranian territory.
U.S. Secretary of State Mike Pompeo directly blamed Iran for the attack on Twitter.
Washington is in talks with Yemen's Iran-aligned Houthi rebels in a bid to end the country's war, a top U.S. official said.
Officials with U.S. Central Command say they're looking into reports that an MQ-9 Reaper has been shot down in Yemen.
Saudi Arabia on Thursday blamed Tehran for a drone attack by Yemen's rebels that knocked out a key oil pipeline.
The veto -- the second in Trump's presidency -- was expected, and Congress lacks the votes to override it.
The House voted to end American involvement in the Yemen war, rebuffing the administration's support for the campaign.