U.S. Ambassador to the United Nations Nikki Haley said the uncertainty of President Trump’s tweets keeps things “interesting” and that she never knows what Trump will tweet as she starts out her day.

“It makes it interesting,” Haley told David Axelrod, an ex-senior adviser to former President Barack Obama, Thursday night at the University of Chicago’s Institute of Politics. “It makes it interesting that when I wake up, I don’t know what he’s going to tweet.”