He was implicated in the organization of the September 1964 coup attempt by Generals Lâm Văn Phát and Dương Văn Đức, both also Catholics, and was sent into exile to serve as Ambassador to the United States.
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On 19 February, Thảo and General Lâm Văn Phát began their coup attempt, seizing the military headquarters, the post office and radio station.
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One of Khiêm's subordinates, Phạm Ngọc Thảo, a Communist double agent, was planning one of the many coup plots that engulfed Saigon and destabilised the regime, with the help of Trần Kim Tuyến.
List of emperors of the Trần Dynasty | Tran | Tran, Bulgaria | Tran Municipality | Trần Văn Hữu | Tran Anh Hung | Nguyen Thien Nhan | Tran Van Khe | Trần Hưng Đạo | Trần Anh Hùng | Namson Tran | Lý Thiên Bảo | Lê Phụ Trần | Kimlinh Tran | Trần Văn Đôn | Tran Thi Ly Bridge | Trần Thị Lý | Trần Thị Dung | Tran Quoc Hien | Trần Quốc Ẩn | Trần Quốc Ân | Tran (novel) | Trần Kim Tuyến | Tran Kim Tuyen | Trần | Thien LE | Nguyễn Thiện Nhân | Đặng Trần Côn |