Kathmandu. A high-ranking security official from Iran has reiterated Tehran's deep mistrust of America, stating that Washington must take practical steps to build an environment of trust.According to the semi-official news agency Tasnim, Iran's Supreme National Security Council Secretary Mohsen Rezai said this on Wednesday during a meeting with Bafel Jalal Talabani, a leader of the Patriotic Union of Kurdistan in Iraq's semi-autonomous Kurdistan region.