KEY POINTS
  • Investors are counting on Trump aide Gary Cohn to help push through tax reform, Yale management expert Jeffrey Sonnenfeld tells CNBC.
  • The New York Times reported that Cohn is "upset" and "disgusted" with Trump's response to violence in Charlottesville, Virginia.
  • "I think if he steps away, it would crash the markets," Sonnenfeld says.

The markets would crash if top White House economic adviser Gary Cohn resigns, Yale School of Management's Jeffrey Sonnenfeld told CNBC on Thursday.

"I don't want to be an alarmist, but there is a lot of faith that he is going to help carry through the tax reform that people are looking for," Sonnenfeld said on "Squawk Box."