Sen. Richard Blumenthal (D-CT) warned on Thursday that the U.S. would need to reevaluate its relationship with Saudi Arabia if Riyadh makes a long-term pivot against efforts to normalize relations with Israel.

Israeli Prime Minister Benjamin Netanyahu suggested this week that Saudi Arabia’s increasing rapprochement with Turkey and Qatar would be a nonstarter for continued normalization efforts. Leading Saudi figures and media have also recently taken a strongly anti-Israel and antisemitic tone, which Netanyahu said provides aid to anti-Israel forces.

“If they’re reversing course on normalization, all bets are off for almost everything, including a defense treaty and other kinds of agreements,” Blumenthal told Jewish Insider. “I would very much regret it, and I think they would too in the long run, because it goes against all of the long-term goals of the kingdom to turn a leaf on terrorism and restore or reimagine their economy with less dependence on oil.”

He added that he “would be very surprised” if Riyadh actually makes such a pivot “and I hope that this indication of a change in course is just a short-term flip.”

Pressed on signals that Riyadh’s long-term vision may be shifting — given Saudi Arabia’s deepening ties to Turkey and Qatar and its recent plans to scale back some of the landmark megaprojects that were part of its Vision 2030 push — Blumenthal said he believes that Crown Prince Mohammed Bin Salman’s plan remains the same.

“I think there continues to be a long-term strategy in MBS’ mind, but there’s no question we need to be very clear-eyed that there are reactionary forces, and frankly antisemitic elements, in the regime,” Blumenthal said. “And we’re going to see those elements bubble up and potentially resist progress — and hopefully not prevent it. But we need to be very mindful of the mantra ‘trust but verify’ when dealing with Saudi.”

Two Republican senators offered a more optimistic view on the future of the U.S.-Saudi relationship.

Sen. Markwayne Mullin (R-OK) said that “every conversation I’ve had with Saudi Arabia is that they’re interested in normalization,” and that he would have to hear from Riyadh directly before judging the consequences of any potential change in direction.

Sen. James Lankford (R-OK) said that he didn’t have a strong read on Saudi Arabia’s current stance on normalization, but that he continues to believe that it is in the U.S.’ and the world’s interest.

“That brings long-term stability to the region,” Lankford said. “It’s been one of the main dividing points in the region is this absurd belief that Israel’s not even a country should be recognized. We don’t break through that until everybody just acknowledges everybody’s sovereignty.”