Analysis of information sources in references of the Wikipedia article "Taoiseach" in Simple English language version.
Article 28.5.1 The head of the Government, or Prime Minister, shall be called, and is in this Constitution referred to as, the Taoiseach.
Article 28.9.4. The Taoiseach may at any time, for reasons which to him seem sufficient, request a member of the Government to resign; should the member concerned fail to comply with the request, his appointment shall be terminated by the President if the Taoiseach so advises.