An early glimpse of his temperament:

From Wapo
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Boehner met the future president during a golf outing at Trump National in Westchester, N.Y., when he joined Boehner and two insurance executives for a round. He doesn’t say the date, but notes he was House minority leader then, so this encounter would have been between 2007 and 2011.

Before they set off, Trump asked a young Boehner staffer the names of the executives.
It was only after 18 holes that the two men summoned the courage to tell Boehner and Trump that they’d been calling them the wrong names all day. Boehner laughed, but Trump turned angry. “This sort of glower fell across his face,” Boehner writes. Then Trump got in the staffer’s face and berated him.

“What are you, some kind of idiot?” Trump shouted. “You want to know how to remember somebody’s name? You f-----g LISTEN!”
There “was something dark about” Trump’s reaction, Boehner observed.

“I’d never seen anybody treat a staffer like that — not in politics, not ever,” Boehner writes. “This was more than New York bluster. This was real anger, over something very, very small. We had no idea then what that anger would do to our country.”
[Post edited by TomGlansAski at 04/09/2021 08:27AM]