Not able to show validation errors for mat-select-country since "form.get('country').touched" always returns false.

  <mat-select-country label="" placeHolder="" formControlName="country" 
                  [trimInput]="true"> </mat-select-country> 
  <mat-error>{{form.get('country').errors.required &&
               form.get('country').touched ? 
                'This field is requied':''}}
  </mat-error>

Thanks in advance.