Unique Validation multiple table in laravel

i want to validate email field to multiple table given logic check only validate one table

 $this->validate($request, [
                'email'     => 'required|email|max:255|unique:users',
                'email'     => 'unique:suspend_users',
            ]);

or

$this->validate($request, [
   'email'     =>'required|email|max:255|unique:users|unique:suspend_users',
            ]);

via Chebli Mohamed