US ambassador to the UN Zalmay Khalilzad has reportedly been pulled up by US State Department officials for unauthorized establishing contacts with PPP Co-chairman Asif Ali Zardari . A senior US official is to be believed, Khalilzad talked to Zardari over phone several times a week for the past month until he was confronted about the unauthorized contacts, a US daily reported. Khalilzad had been advised to stop speaking freely to Zardari , and that it was not clear whether he would face any disciplinary action, added the official.