KABUL (AFP) - Afghan lawmakers Sunday urged the United Nations to support their resistance to moves by a special election tribunal to throw over 60 of them out of parliament over alleged vote fraud. The members of parliament (MPs) met the United Nations representative in Afghanistan, Staffan de Mistura, amid a spiralling crisis gripping the country's political system weeks before foreign troops start to withdraw. Some analysts accuse Afghan President Hamid Karzai, who ordered the establishment of the special tribunal, of using it to try and boost the number of his supporters in Afghanistan's lower house of parliament, the Wolesi Jirga. A United Nations Assistance Mission in Afghanistan (UNAMA) statement said members of the 249-seat Wolesi Jirga Sunday gave de Mistura a letter addressed to UN Secretary-General Ban Ki-moon appealing for support. De Mistura told them that the issues under dispute must be resolved "in accordance with the constitution." He also urged them to "act responsibly" in making their case "and not resort to sit-ins, protests or other actions which could provoke public unrest," the UNAMA statement said.