Eloquent User Where Clause with Entrust Library

I'm trying to select all users for a company. But only users who has "admin" role status (Entrust, etc.).

User::where('company_id', Auth::user()->company_id)->hasRole('admin')->get();

The above is throwing an error. Left a bit lost on how to run such a query. Where am I going wrong with this? Very little documentation on Entrust.

via Chebli Mohamed