Americans suspected Stalin had fabricated the assassination plot as an excuse to have Roosevelt moved to the Soviet embassy. Mike Reilly, Roosevelt's chief of Secret Service, advised him to move to either the Soviet or British embassies for his safety. One of the underlying factors influencing their decision was the distance Churchill and Stalin would need to travel for meetings at the American legation. Harriman reminded the President that the Americans would be held responsible if Stalin or Churchill were assassinated while traveling to visit Roosevelt all the way across the city. Earlier that day, Molotov had agreed to hold all meetings at the American legation because traveling was difficult for Roosevelt. The timing of Molotov announcing an assassination plot later that night aroused suspicion that his motives were to keep Stalin safely within the guarded walls of the Soviet embassy. Harriman doubted the existence of an assassination plot, but urged the President to relocate to avoid the perception of putting Churchill and Stalin in danger. Roosevelt did not believe there was a credible threat of assassination, but agreed to the move so he could be closer to Stalin and Churchill. Living in the Soviet embassy also allowed Roosevelt to gain more direct access to Stalin and build his trust. Stalin liked having Roosevelt in the embassy because it eliminated the need to travel outside the compound and it allowed him to spy on Roosevelt more easily. The Soviet embassy was guarded by thousands of secret police and located adjacent to the British embassy, which allowed the Big Three to meet securely.