A coup d’état (/ˌkuːdeɪˈtɑː/ ⓘ; French: [ku deta] ⓘ; lit. ‘stroke of state’),[1] or simply a coup, is typically an illegal and overt attempt by a military organization or other government elites to unseat an incumbent leadership.[2][3] A self-coup is when a leader, having come to power through legal means, tries to stay in power through illegal means.[3]

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 illegally through the actions of themselves and/or their supporters.[27] The leader may dissolve or render powerless the national legislature and unlawfully assume extraordinary powers. Other measures may include annulling the constitution, suspending civil courts, and having the head of government assume dictatorial powers.[28][29]

In a self-coup, which is a form of coup, the leader may dissolve or render powerless the national legislature and unlawfully assume extraordinary powers.

I’d say this qualifies, although it’s in an unusual form. I think it applies better than “constitutional crisis” to the current events.

https://en.wikipedia.org/wiki/Coup_d'état