> A self-coup, also called an autocoup (from Spanish autogolpe) or coup from the top, is a form of coup d'état in which a political leader, having come to power through legal means, stays in power through illegal means through the actions of themselves and/or their supporters.[1] The leader may dissolve or render powerless the national legislature and unlawfully assume extraordinary powers. Other measures may include annulling the nation's constitution, suspending civil courts, and having the head of government assume dictatorial powers.[2][3]

https://en.wikipedia.org/wiki/Self-coup

For a recent example see the events in South Korea with President Yoon.