CIA Director Gina Haspel paid her respects at the casket of former president George H.W. Bush as he lay in state at the US Capitol, before she briefed US senators on Saudi Arabia's possible involvement in the murder of journalist Jamal Khashoggi

Washington (AFP) - Two key US Republican senators said Tuesday after a briefing by the CIA’s director that they have “zero” doubt Saudi Arabia’s crown prince directed the murder of journalist Jamal Khashoggi.

The explosive new declarations by members of President Donald Trump’s own party run counter to the White House narrative downplaying possible links between Crown Prince Mohammed bin Salman and the October killing of journalist and palace critic Khashoggi at the kingdom’s Istanbul consulate.

“I have zero question in my mind that the crown prince directed the murder and was kept appraised of the situation all the way through it,” Senate Foreign Relations Committee Chairman Bob Corker told reporters after CIA director Gina Haspel briefed a small group of senators.

“If MBS were in front of a jury, he’d be convicted in less than 30 minutes.”

Fellow Republican Senator Lindsey Graham, a Trump ally who has joined a growing collection of lawmakers urging the president to take a far tougher stance against Riyadh over the killing, also attended the hour-long closed-door briefing, and minced no words afterwards.

The crown prince is “crazy” and “a wrecking ball” who is “complicit in the murder of Mr Khashoggi to the highest level possible,” Graham said in withering criticism of an American ally.

“There’s not a smoking gun but a smoking saw.”

The South Carolina senator was directly repudiating comments by top Trump administration officials, including Defense Secretary Jim Mattis, who just last week said there was “no smoking gun” implicating the crown prince.

Senators would not describe the evidence presented by Haspel.

US newspapers, including The Wall Street Journal, have reported that the CIA has evidence that Prince Mohammed exchanged 11 messages with his close aide Saud al-Qahtani, who allegedly oversaw the murder, just before and after it took place.

Some of the most important evidence may be an audio recording of the murder that Turkey said it has distributed, but Graham said that was not played in Tuesday’s briefing.

- ‘He is dangerous’ -

But “the brutality of this murder is beyond my sharing it with you,” Graham said.

Republican Senator Lindsey Graham of South Carolina leaves Haspel's briefing

“If the Saudi government is going to be in the hands of this man for a long time to come, I find it very difficult to be able to do business, because I think he’s crazy, I think he is dangerous and he has put the relationship at risk.”

After reports that the CIA concluded that the crown prince ordered Khashoggi’s assassination in the Istanbul consulate on October 2, Trump issued a statement saying US-Saudi relations and oil market stability were too important to rock over the scandal.

Under mounting pressure from lawmakers who wanted action against Riyadh, Mattis and Secretary of State Mike Pompeo told senators where they said there was no direct evidence linking the crown prince to the murder.

Graham rejected their assessment outright.

“You have to be wilfully blind not to come to the conclusion that this was orchestrated and organized by people under command of MBS, and that he was intricately involved in the demise of Mr Khashoggi,” the senator said.

Democrats provided similar reactions after the briefing, which was provided to leaders of Senate committees that focus on national security.

“I am now more convinced than I was before – and I was pretty convinced – that in fact the United States must have a strong response to both the war in Yemen as well as the killing of the United States permanent resident and journalist Jamal Khashoggi,” Senate Democrat Bob Menendez said.

Khashoggi was murdered in Saudi Arabia's Istanbul consulate by a team under the direction of the Saudi crown prince, Republican US lawmakers now believe

The White House faced a rebuke last week when the Senate voted to advance legislation that would end US support for the Saudi-led coalition fighting a war in Yemen, which has been described as the world’s worst humanitarian crisis.

Fourteen Republicans voted to move it forward, heaping pressure on Trump to act.

The Yemen legislation could set up a bitter year-end Senate floor fight over US war powers. Some lawmakers like Graham want a bill with teeth that will punish Saudi Arabia, while others are keen not to antagonize the White House.

There are several proposals in the works, including freezes on all US arms sales to Riyadh and tightening sanctions on those involved in Khashoggi’s murder.

Pompeo urged senators last week to maintain America’s increasingly contentious support for the Saudi coalition, arguing that pulling back would worsen the brutal Yemen conflict.