Me. Rev. Stat. tit. 5, § 127

Upon written complaint of any person that the Treasurer of State is mentally ill or insolvent, or has absconded or concealed the Treasurer of State's identity or person to avoid the Treasurer of State's creditors, or is absent from the State and neglecting the duties of the Treasurer of State to the hazard of the trust reposed in the Treasurer of State, or has violated any provision of section 125, or has failed faithfully to perform the duties of the Treasurer of State, the Governor shall immediately examine into the charges and if any of them is found true, the Governor shall remove the Treasurer of State and declare the office vacant.