A Trump biographer suggested that the reason Trump bombed Iran again was to get attention during the recent NATO summit.

During an episode of Inside Trump's Head podcast, biographer and author Michael Wolff said that the idea of Trump bombing Iran was to "upstage" his counterparts at the NATO summit.

"It sums up exactly who he is and what he does," Wolff said. "The only intention here is the attention paid to him."

Wolff pointed out that every time Trump visits NATO, "it has always been a kind of moment of holding their breath" because "he doesn't like to be among a group of equals, he just doesn't like the look" and "it's someplace that he dislikes, intensely dislikes being there."

Before the summit, Wolff spoke with a White House insider who worried "he's going to do something" to reclaim the spotlight from the group of equals around him.

"And I think that's exactly what we've seen," Wolff said. "He arrives there, and it's, 'What do I do to claim all of the attention?' And, I mean, this has been a series of kind of things, including going back to war in Iran."

Other examples of upstaging NATO allies included renewing demands for the U.S. to have control of Greenland and "dissing" European allies as he did with Spain, Wolff noted.

"So essentially, how could he not but become the center of attention here?" Wolff said. "This is the fundamental point to remember. That's what this is about. This is about attention. Donald Trump is about attention. He's not about policy. He's not about accomplishments. He's certainly not about cooperation, which is the nature of NATO. It's just about attention."