Somalia on Thursday told the UN Security Council not to interfere in its national affairs after expelling a UN envoy who questioned the government's decision to arrest an al-Shabaab defector running for election.Somali Ambassador Abukar Dahir Osman did not specifically mention his government's decision to order Nicholas Haysom to leave but he argued that Somalia was in need of support, not criticism from the world body."The UN and its representatives have a duty, even an obligation, to respect their mandate and to not interfere in our internal affairs, and to let the Somalis control their own destiny," said the ambassador.In his address to the council, Haysom did not comment on the government's order to expel him but he renewed his criticism of Mogadishu authorities after 15 people were killed in electoral violence.The council then met behind doors to discuss the fate of the UN envoy who took up his post in October. Addressing the council, Haysom warned of a risk of conflict during elections in Somalia's federal states due to tensions with the central authorities."We witnessed this during the electoral process in South West State," he said."Allegations of interference by the FGS (federal government of Somalia) and the violence which erupted following the arrest of one of the candidates, a former al-Shabaab deputy leader, marred the process and does not bode well for upcoming electoral processes in other regions or for the 2020 national elections," he added.Rebranded terrorism The Somali government ordered Haysom to leave after he wrote a letter requesting information on the legal basis for the arrest of Muktar Robow who was running for the post of regional president of South West State.Robow, who defected from al-Shabaab in 2017, was arrested last month and flown to the capital Mogadishu.The arrest sparked protests in the southwestern town of Baidoa that were violently suppressed by Somalia's security forces, leaving at least 15 dead.In his letter, Haysom requested an investigation of the protest violence and stressed that UN-backed security forces must respect human rights.The Somali ambassador told the council that former Shabaab militants "cannot assume leadership positions without going through stringent established rehabilitation programs.""We reject the criticism and attempt to rebrand renewed terrorism as ice cream salesperson without redeeming themselves," he said.Diplomats said UN Secretary-General Antonio Guterres had appealed to Somali President Mohamed Abdullahi Mohamed following the decision announced Tuesday to expel Haysom, a South African lawyer and experienced diplomat who also served as envoy to Sudan and South Sudan.The UN mission in Somalia is tasked with supporting peace efforts and the strengthening of government institutions in the Horn of Africa nation, which were ruined by decades of civil war.