Passage: In January 1964, a mutiny occurred at the military barracks at Jinja, Uganda's second city and home to the 1st Battalion of the Uganda Army. There were similar mutinies in two other eastern African states; all three countries requested the support of troops from the British military. Before they arrived, however, Obote sent his defence minister Felix Onama to negotiate with the mutineers. Onama was held hostage, and agreed to many demands, including significant pay increases for the army, and the rapid promotion of many officers, including the future president Idi Amin. In 1965, Kenyans had been barred from leadership positions within the government, and this was followed by the removal of Kenyans en masse from Uganda in 1969, under Obote's guidance.As prime minister, Obote was implicated in a gold smuggling plot, together with Idi Amin, then deputy commander of the Ugandan armed forces. When the Parliament demanded an investigation of Obote and the ousting of Amin, he suspended the constitution and declared himself President in March 1966, allocating to himself almost unlimited power under state of emergency rulings. Several members of his cabinet, who were leaders of rival factions in the party, were arrested and detained without charge. Obote responded with an armed attack upon Mutesa's palace, which ended with Mutesa fleeing to exile. In 1967, Obote's power was cemented when the parliament passed a new constitution that abolished the federal structure of the independence constitution and created an executive presidency.

Question: What did Obote do when Parliament wanted an investigation?
suspended the constitution and declared himself President in March 1966,