The British government's UN resolution calling for a Yemen ceasefire has been blocked by heavy lobbying from Saudi Arabia and the United Arab Emirates, chief participants in the war. "But I'm voting on our ability to have a debate, as it relates to our ability to have a relationship with Saudi Arabia".
The Senate vote came after a closed-door briefing by Secretary of State Mike Pompeo and Secretary of Defense Jim Mattis.
USA intelligence officials have concluded that the Saudi crown prince, Mohammed bin Salman, must have at least known of the plot, but Trump has equivocated over who was to blame.
The visit by the prince, the kingdom's de facto ruler, to the summit of industrialized nations is fraught with controversy over the killing of Saudi journalist Khashoggi in the Saudi consulate in Istanbul in October.
Khashoggi, who lived in the USA and wrote for the Washington Post, was killed in the Saudi embassy in Turkey. "I can not recall a briefing on such a sensitive nature where we have been denied access to the intelligence agencies of the United States".
Trump has cast doubt on who is to blame for the murder.
White House Press Secretary Sarah Sanders said on Thursday the trilateral meeting with Prime Minister Narendra Modi will be held towards the end of the Trump-Abe talks. The official spoke on the condition of anonymity to discuss internal matters.
Specifically, the resolution "directs the President to remove U.S. Armed Forces from hostilities in or affectingYemen, except those engaged in operations directed at Al Qaeda, within 30 days unless: (1) the President requests and Congress authorizes a later date, or (2) a declaration of war or specific authorization for the use of the Armed Forces has been enacted".
When the Senate voted on the same resolution back in March, it failed 55-44, with 10 Democrats voting against it. Wednesday's procedural vote got the support of every Senate Democrat and 14 Republicans, including Sen.
"I don't think there's anybody in the room that doesn't believe he was responsible for it", Senator Bob Corker, the Republican chairman of the Senate Foreign Relations Committee, told reporters after the briefing.
But the moment represented a highly symbolic act of defiance, coming a few hours after the administration had wheeled out two of its biggest guns, the secretary of state, Mike Pompeo, and defence secretary, James Mattis, to brief the entire senate on the essential importance to U.S. national security of USA support for the Saudi-led coalition. "But degrading US-Saudi ties would be a grave mistake for the national security of the US and its allies".