i.remoteClients = make(map[string]kube.CLIClient)
	}
	// Validate if "all" incoming contexts are present in the kubeconfig. Fail fast if not.
	rawConfig, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(kube.ConfigLoadingRules(*i.kubeconfig), nil).RawConfig()
	if err != nil {
		return nil, fmt.Errorf("getting raw kubeconfig from file %q: %v", *i.kubeconfig, err)
	}
	impersonateConfig := i.getImpersonateConfig()