In March 1933 a constitutional crisis developed in Siam over the "Yellow Cover Dossier" incident, precipitated by Pridi's draft economic plan, which contained socialist elements. Because of this, Phraya Manopakorn Nititada, the prime minister, expelled him from the cabinet and suspended the constitution. This action upset many in the People's Party who supported Pridi, including Phraya Phahon. On 15 June Phraya Phahon resigned from the cabinet citing health reasons. In truth, he and a couple of military officers planned to overthrow Phraya Mano's increasingly authoritarian government. On 20 June a bloodless coup was carried out, led by Phraya Phahon. The following day, Phraya Phahon appointed himself the second prime minister of Siam. He immediately sent a report to King Prajadhipok explaining the objectives of the coup and asked for the king's support. Reluctantly the king endorsed him. Phraya Mano was exiled to Malaysia.