U.S. President Donald Trump vented his frustration with NATO during a private meeting with its secretary-general, Mark Rutte, on Wednesday as relations in the military alliance reached a crisis point over the Iran war.

“He is clearly disappointed with many NATO allies, and I can see his point,” Rutte said on CNN’s “The Lead with Jake Tapper,” after spending more than two hours at the White House. “This was a very frank, very open discussion, but also a discussion between two good friends.”

Rutte ?spoke hours after White House spokeswoman Karoline Leavitt quoted Trump as saying of NATO: “They were tested, and they failed,” during the Iran war.