<p>Chelsea Clinton is so unpleasant to colleagues, she’s causing high turnover at the Bill, Hillary and Chelsea Clinton Foundation, sources say.</p>
<p>Several top staffers have left the foundation since Chelsea came onBoard as vice chairman in 2011.</p>
<p>“A lot of people left because she was there. A lot of people left because she didn’t want them there,” an insider told me. “She is very difficult.”</p>