When housing accommodations for the meeting were originally discussed, both Stalin and Churchill had extended invitations to Roosevelt, asking him to stay with them during the meeting. However, Roosevelt wanted to avoid the appearance of choosing one ally over another and decided it was important to stay at the American legation to remain independent. Roosevelt arrived in Tehran on 27 November 1943 and settled into the American legation. Close to midnight, Vyacheslav Molotov, Stalin's top aide, summoned Archibald Clark-Kerr (the British ambassador in the Soviet Union) and Averell Harriman (the American ambassador in the Soviet Union) to the Soviet embassy, warning them of an assassination plot against Roosevelt, Churchill and Stalin. Molotov informed them several assassins had been apprehended, but reported additional assassins were at large and expressed concerns for President Roosevelt's safety. Molotov advised Roosevelt should be moved to the safety of the British or Soviet embassy.