US President Donald Trump indicated in an interview published Wednesday that, although he could remove troops from the Middle East, citing cheaper oil as an explanation, one reason not to do so is concern for Israel’s security.

“Now, are we going to stay in that part of the world? One reason to is Israel,” Trump told the Washington Post.

“Oil is becoming less and less of a reason because we’re producing more oil now than we’ve ever produced,” he added, appearing to envision a world where the US would be less beholden to Saudi Arabia. “So, you know, all of a sudden it gets to a point where you don’t have to stay there.”

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Trump publicly thanked Riyadh last week for plunging oil prices, after he was harshly criticized for deciding not to further punish the kingdom for the killing of US-based columnist Jamal Khashoggi.

Trump last week suggested that Israel would face major regional difficulties in the Middle East were it not for the stabilizing presence of Saudi Arabia, explaining his decision not to take measures against Riyadh.

“Israel would be in big trouble without Saudi Arabia,” Trump told reporters at the time from his Mar-a-Lago resort home in Florida.

During Wednesday’s wide-ranging interview, Trump also threatened to cancel an upcoming meeting with Russian President Vladimir Putin over the capture of three Ukrainian ships and their crew in the Black Sea this week.

Ukraine’s parliament voted Monday to impose martial law in parts of the country to fight what its president called “growing aggression” from Moscow, after the weekend naval clash off the disputed Crimean Peninsula, in which Russia fired on and seized three Ukrainian vessels, amid renewed tensions between the neighbors.

Western leaders and diplomats have urged both sides to deescalate the conflict, and the US has blamed Russia for what it called “unlawful conduct” over Sunday’s incident in the Black Sea.

Trump said he was awaiting a “full report” by his national security team on the matter: “That will be very determinative. Maybe I won’t have the meeting.”

“I don’t like that aggression,” he added. “I don’t want that aggression at all. Absolutely. And by the way, Europe shouldn’t like that aggression. And Germany shouldn’t like that aggression.”

The US president reiterated his rejection of a federal government report released last week that concluded that damage from global warming was intensifying, saying he does not believe the scientific consensus that the crisis is man-made.

“One of the problems [is] that a lot of people like myself, we have very high levels of intelligence, but we’re not necessarily such believers,” Trump told the Washington Post. “You look at our air and our water, and it’s right now at a record clean.”

Much of the interview was dedicated to Trump’s criticism of Federal Reserve Chair Jerome Powell, nominated by the president last year. Trump said he was “not even a little bit happy with my selection” so far, but the report detailed an unorthodox reason for his decision not to reappoint predecessor Janet Yellen — her height.

The 5-foot-3-inch (160-centimeter) economist, who is Jewish, is “not tall enough” to lead the country’s central bank, Trump told aides on the National Economic Council on several occasions, the newspaper said, citing current and former officials. The officials said Trump had also asked them whether they agreed with his opinion on her height.

Times of Israel staff and agencies contributed to this report.