Tzipi Livni, the Israeli opposition leader, has spoken out against the current government's handling of negotiations with the Palestinians. <br /><br />She said she disagreed with Israeli Prime Minister Binyamin Netanyahu's rejection of a US proposal to extend a moratorium on illegal settlement building. Livni made the comments alongside Salam Fayyad, the Palestinian prime minister, in a rare joint interview.<br /><br />He called into question the credibility of the negotiations and the US-led peace process. <br /><br />The comments come after Hillary Clinton, the US secretary of state, invited Livni for a private meeting in Washington on Friday. It is the first time the two had met outside of Israel since Netanyahu came into office. <br /><br />Meanwhile, George Mitchell, the US envoy to the Middle East, is now on his way back to the region. <br /><br />Al-Jazeera's Rosiland Jordan reports.